Hardware Procurement and Network Topology Assessment
You are building a serious piece of network infrastructure. A DNS sinkhole must operate with higher reliability than the devices it serves. If your Pi-hole fails, your internet access. Consequently, hardware selection is not about raw power; it is about stability, efficiency, and endurance. Do not repurpose an old, overheating laptop or a generic SD card found in a drawer. The following specifications define the operational baseline for a 24/7 ad-blocking node in 2026.
Single Board Computer (SBC) Selection
The common misconception is that you need a computer to filter DNS traffic. This is false. DNS queries are lightweight text strings. A Raspberry Pi 5 or 4 Model B is mathematically excessive for this task. These boards idle between 3. 0 and 5. 0 watts. They generate significant heat. They require active cooling.
The superior choice for a dedicated Pi-hole appliance is the Raspberry Pi Zero 2 W. It utilizes a quad-core processor capable of handling millions of queries per day yet idles at approximately 0. 5 watts. This efficiency reduces thermal stress and eliminates the need for fans. If the Zero 2 W is unavailable, the Raspberry Pi 3 Model B+ remains a viable alternative due to its native Ethernet port, though it consumes more power.
Avoid the original Raspberry Pi Zero (single core). While it can technically run the software, the interface becomes sluggish during log analysis. We prioritize administrative responsiveness. The Zero 2 W strikes the exact balance between performance and energy consumption.
| Model | Idle Power (Watts) | Annual Cost (Est. @ $0. 15/kWh) | Suitability |
|---|---|---|---|
| Raspberry Pi 5 | ~4. 0 W | $5. 25 | Overkill / High Heat |
| Raspberry Pi 4B | ~3. 0 W | $3. 94 | Inefficient |
| Raspberry Pi Zero 2 W | ~0. 5 W | $0. 66 | Optimal |
| Raspberry Pi 3B+ | ~1. 9 W | $2. 50 | Acceptable |
Storage Media: The Endurance Imperative
The most frequent cause of Pi-hole failure is SD card corruption. Standard microSD cards are designed for sequential writes, such as recording video or storing photos. They are not engineered for the random read/write operations of an operating system logging DNS queries every second. A standard “Class 10” card likely fail within 6 to 12 months under 24/7 operation.
You must purchase a High Endurance or Max Endurance microSD card. These cards use NAND flash memory capable of withstanding significantly more write pattern. A 32GB card is sufficient. The operating system and Pi-hole database rarely exceed 4GB. yet, higher capacity cards (64GB or 128GB) offer greater longevity because the wear-leveling algorithms have more blocks to distribute write operations.
Verified Models (2020, 2026):
- Samsung PRO Endurance (Rated for up to 140, 000 hours of recording)
- SanDisk Max Endurance (Rated for up to 120, 000 hours)
- SanDisk High Endurance (Rated for up to 20, 000 hours)
Power Delivery Systems
Voltage stability is non-negotiable. The Raspberry Pi requires 5. 1V to operate reliably. Most generic USB phone chargers provide 5. 0V nominally drop to 4. 7V or 4. 8V under load. This voltage sag causes the Pi to throttle its CPU or disable USB peripherals. In severe cases, it corrupts the SD card during write operations.
Use the Official Raspberry Pi Power Supply. It is calibrated to output 5. 1V. This slight over-voltage compensates for resistance in the cable and guarantees the board receives a steady 5. 0V even during computation spikes. If you use a Zero 2 W, a high-quality 2. 5A micro-USB power supply is mandatory. Do not power the Pi from the USB port of your router; current delivery is frequently insufficient and fluctuates wildly.
Network Connectivity: Ethernet vs. Wi-Fi
A DNS server must have low latency. Every web request, image load, and background process begins with a DNS query. If your DNS server adds 50 milliseconds of latency, browsing feels sluggish regardless of your fiber connection speed.
Wi-Fi introduces variable latency (jitter). Interference from neighbors, microwaves, or other devices causes packet delays. Ethernet provides consistent, sub-millisecond latency. If you select the Raspberry Pi Zero 2 W, you must purchase a Micro-USB to Ethernet adapter. Hardwiring the device to your router or switch is mandatory for a stable deployment.
Technical Note: Tests conducted in 2024 show that Wi-Fi 6 networks still exhibit latency spikes of 60-70ms during congestion. Ethernet consistently maintains <1ms local latency. For a service queried thousands of times per hour, these spikes accumulate into noticeable lag.
Network Topology Assessment
Before connecting hardware, you must map your current network logic. The Pi-hole sits inside your Local Area Network (LAN). It does not replace your router. It replaces your router’s DNS function.
The Logical Flow
In a standard home network, the flow of data follows this hierarchy:
- ISP Modem/Gateway: Connects to the internet.
- Router: Distributes local IP addresses via DHCP.
- Clients: Phones, laptops, and smart TVs request an IP and a DNS server from the router.
When you install a Pi-hole, you alter the assignment logic. The router must tell clients to use the Pi-hole’s IP address (e. g., 192. 168. 1. 50) for DNS, not the ISP’s default servers. This requires one of two configurations:
Method A: Router DNS Assignment (Preferred)
You configure the router’s DHCP settings to distribute the Pi-hole’s IP as the primary DNS server. All devices automatically route queries to the Pi-hole upon reconnecting.
Method B: Pi-hole DHCP (The Workaround)
ISP-provided gateways (Xfinity, AT&T, Spectrum) lock the DNS settings. They prevent you from changing the DNS server to preserve their ability to harvest your data. In this scenario, you disable the DHCP server on the ISP router and enable the DHCP server built into the Pi-hole. The Pi-hole then manages IP distribution and forces all clients to use itself for DNS.
Pre-Flight Network Reconnaissance
Execute the following checks to determine your installation route:
1. Identify the Gateway IP
On a computer connected to your network, open a terminal (Command Prompt on Windows, Terminal on macOS).
Windows: Type ipconfig. Look for “Default Gateway”.
macOS/Linux: Type route get default | grep gateway.
This IP ( 192. 168. 1. 1 or 10. 0. 0. 1) is your router’s address.
2. Verify Admin Access
Enter the Gateway IP into a browser. Log in. If you do not know the credentials, check the sticker on the device. If the ISP manages the credentials and refuses to release them, you be forced to use Method B (Pi-hole DHCP).
3. Locate DNS Settings
Search the router interface for “LAN Setup,” “DHCP Server,” or “DNS Settings.” You are looking for a field that allows you to input a custom IP address for “Primary DNS.” If this field is greyed out or non-existent, your router is locked.
The 20-Point Fan-Out: Phase 1
We address the most common hardware and topology questions immediately to prevent configuration errors later.
Q1: Can I run Pi-hole over Wi-Fi if I have a strong signal?
Technically yes, operationally no. DNS relies on UDP packets which are fire-and-forget. Packet loss on Wi-Fi results in timeouts (hanging webpages). Wire it.
Q2: Does the Pi-hole slow down my download speeds?
No. The Pi-hole only processes DNS queries (phonebook lookups). It does not route the actual video or file data. Your bandwidth remains untouched.
Q3: Can I power the Pi from the router’s USB port?
No. Router USB ports frequently adhere to strict 500mA limits. The Pi Zero 2 W may spike above this during updates, causing a crash. Use a dedicated wall adapter.
Q4: Do I need a monitor and keyboard for the Pi?
Only for the 10 minutes if you fail to configure “headless” SSH access. configure the device to be controlled entirely from your main computer.
Q5: What happens if the power goes out?
The Pi reboots automatically. yet, without a battery backup (UPS), SD card corruption is possible. This reinforces the need for a High Endurance card and a backup of your configuration (covered in Section 12).
Q6: Why not use a Docker container on my main PC?
If your main PC reboots, sleeps, or crashes, the internet goes down for the entire house. A dedicated appliance ensures network stability independent of your desktop usage.
Q7: this block YouTube ads?
No. YouTube serves ads from the same domains as the video content. DNS blockers cannot distinguish between the two. You need browser-based extensions for that.
Q8: Does Pi-hole work with IPv6?
Yes. It handles both A (IPv4) and AAAA (IPv6) records. configure both to prevent ads from leaking through the IPv6 protocol.
Q9: My router has a “DNS Rebind Protection” feature. Does this matter?
Yes. This feature can block the Pi-hole from resolving local hostnames. You may need to whitelist the Pi-hole or disable this feature if local resolution fails.
Q10: Can I use a 64GB card if the image is only 4GB?
Yes. The extra space is beneficial. The controller spreads write operations across the larger unused space, significantly extending the card’s lifespan.
With your hardware procured and your router’s limitations identified, you are ready to prepare the installation environment. The physical assembly and operating system flash process begin in the section.
Flashing Raspberry Pi OS Lite for Headless Deployment
| Setting | Value | Technical Requirement |
|---|---|---|
| Hostname | pi-hole |
Identifies the device on your network router. |
| Username | admin (or custom) |
Security Risk: The default user pi was removed in 2022. You must create a new user. |
| Password | [Strong Password] | Do not use “raspberry”. This device controls your network traffic. |
| Wireless LAN | [Your SSID] | Enter your 2. 4GHz Wi-Fi credentials. The Zero 2 W does not support 5GHz. |
| SSH | Enable SSH | serious: Select “Use password authentication” or upload your public key. Without this, not connect. |
| Locale | [Your Timezone] | Required for accurate log timestamps and DNSSEC validation. |
5. Write and Verify Click Save and then Yes to begin writing. The Imager download the OS, write it to the card, and perform a bit-by-bit verification. Warning: If the verification fails, the SD card is defective. Do not proceed. Replace the card. ### Technical Mechanics of the Headless Boot When the Imager writes the OS, it mounts the FAT32 boot partition and injects a file named `firstrun. sh` (or `userconf. txt` depending on the exact sub-version of Bookworm). It also generates a NetworkManager configuration file. In previous versions (Bullseye and earlier), users manually placed a `wpa_supplicant. conf` file in the boot partition. This method is deprecated and unreliable in 2026. Raspberry Pi OS Bookworm uses NetworkManager as the default networking backend. The Imager v2. 0 correctly formats the connection profile for NetworkManager. Manual text file manipulation frequently leads to syntax errors and connection failures. ### Post-Flash Deployment Once the Imager reports “Write Successful,” remove the SD card. 1. Insert the microSD card into the Raspberry Pi Zero 2 W. 2. Connect the power supply to the port labeled PWR (the outer port), not the USB data port. 3. Observe the green LED. It blink erratically for 30-60 seconds as the OS expands the filesystem and applies the customization settings. Do not unplug the device during this minute. The Pi is generating SSH host keys and applying the Wi-Fi profile. If you interrupt this process, the filesystem may corrupt, requiring a full re-flash. ### Verifying Network Presence After 60 seconds, the device should be online. You do not need a monitor to verify this. Open a terminal on your computer (Command Prompt on Windows, Terminal on macOS) and run a ping command: `ping pi-hole. local` If the response shows an IP address (e. g., `Reply from 192. 168. 1. 15: bytes=32…`), the headless setup is successful. If the request times out, check your router’s “Connected Devices” list to find the IP address manually.
Security Note: The default behavior of Raspberry Pi OS disables the “pi” user. If you attempt to SSH using
ssh pi@pi-hole. localand it fails, it is because that user does not exist. You must use the username you defined in the Imager customization step (e. g.,ssh admin@pi-hole. local).
With the OS running and accessible via the network, the hardware phase concludes. The device is a blank Linux server waiting for the Pi-hole application.
Executing the Curl-Based Installation and Verifying Dependencies
The Security of Piping to Bash
You are about to execute a command that security professionals frequently debate. The standard Pi-hole installation method involves downloading a script from the internet and piping it directly into your shell for immediate execution. In a high-security environment, this is an antipattern. It requires absolute trust in the domain owner and the integrity of the transport. For a home network appliance, this risk is generally accepted, provided you verify the source. The installer is hosted at `install. pi-hole. net`. Before execution, you must ensure your Raspberry Pi OS (Bookworm or later) is fully updated to prevent dependency conflicts during the script’s logic execution.
Prerequisite Command:
sudo apt update && sudo apt upgrade -y
Network Configuration: The Static IP Imperative
The installer attempt to configure a static IP address for you, relying on the script to modify OS-level network configurations on Raspberry Pi OS Bookworm (Debian 12) is error-prone. Bookworm replaced `dhcpcd` with NetworkManager. If the installer attempts to write to `/etc/dhcpcd. conf`, the settings be ignored, and your Pi-hole may drift to a new IP address after a reboot, breaking DNS for every device on your network. Mandatory Action: Set a DHCP reservation on your router before running the installer. Assign the Raspberry Pi’s MAC address to a fixed IP (e. g., 192. 168. 1. 2). This ensures the IP remains constant regardless of the OS’s internal network stack.
Executing the Installation
Once the OS is updated and the IP is reserved, execute the following command. This triggers the automated installer which detects your architecture, verifies your OS version, and begins the fetch process.
curl -sSL https://install. pi-hole. net | bash
If you require a review of the code before execution, a practice recommended for serious infrastructure, clone the repository manually:
git clone --depth 1 https://github. com/pi-hole/pi-hole. git Pi-hole
cd "Pi-hole/automated install/"
sudo bash basic-install. sh
The FTL v6 Architecture Shift
If you are reading older documentation (pre-2025), you expect the installer to download `lighttpd` (a web server) and `php` (to process the dashboard). As of Pi-hole v6 (standardized in late 2025), this architecture has been retired. The FTL (Faster-Than-Light) engine includes an web server. This shift reduces the dependency footprint significantly. The installer no longer load your system with a general-purpose web server or the PHP Common Gateway Interface (CGI). The result is a leaner, more secure appliance with fewer attack vectors.
Verified Dependency List (2026 Standard)
The installer verifies and pulls the following core packages. If these are missing, the script invokes `apt` to retrieve them.
| Package | Role | Criticality |
|---|---|---|
| pihole-FTL | DNS Resolver & Web Server | High |
| cron | Scheduled log rotation and updates | Medium |
| curl | Fetching blocklists and updates | High |
| iproute2 | Network interface management (ip command) | High |
| ca-certificates | SSL verification for blocklist downloads | High |
| idn2 | International Domain Name handling | Medium |
Navigating the Ncurses Interface
The installer uses a text-based user interface (ncurses). You encounter several decision points. Accept the defaults for most, pay attention to the following specific screens: 1. Select Upstream DNS Provider: The installer asks who should resolve queries that are not blocked. Google (8. 8. 8. 8) is the default, for privacy, select Quad9 (filtered, ECS-disabled) or Cloudflare. This setting can be changed later. 2. Blocklist Selection: The default StevenBlack list is sufficient for 90% of users. It blocks approximately 150, 000 to 200, 000 known ad and tracker domains without breaking legitimate services. 3. Web Interface: Select On. Even with the CLI available, the dashboard provides necessary visualization of network traffic. 4. Web Server: The installer confirm the use of the internal FTL web server. Confirm Yes.
Post-Installation Verification
Upon completion, the script outputs a final status screen containing your IPv4/IPv6 addresses and a randomly generated administrative password. Write this password down immediately. It is not stored in plain text and cannot be retrieved, only reset. To verify the service is active and the FTL engine is bound to the correct ports, run the following diagnostic command:
sudo systemctl status pihole-FTL
You must see `Active: active (running)` in green. If the status is `failed`, the most common cause in 2026 is a port conflict with `systemd-resolved` on port 53., verify the web interface is accessible by navigating to `http:///admin` in a browser. The dashboard should load instantly, powered by the FTL server.
Performance Metrics: v6 vs Legacy
The transition to the v6 architecture has measurable benefits for hardware endurance. By removing the PHP/Lighttpd stack, the idle load on the Raspberry Pi Zero 2 W drops, and memory usage decreases, leaving more RAM available for the DNS cache.
Chart: Resource Overhead Reduction (v5 vs v6)
/* Red for Legacy / / Green for v6 */
Legacy v5
Modern v6
Enforcing Static IP Allocation to Guarantee DNS Stability
The Stability Imperative: Why IPs Destroy DNS
A Domain Name System (DNS) server operating on a IP address is a network architect’s worst failure mode. In a standard home network, your router acts as a DHCP ( Host Configuration Protocol) server, assigning temporary IP addresses to devices as they join. These assignments, known as “leases,” expire every 24 hours. When a lease expires, the router may assign a different IP address to the device.
For a laptop or smartphone, this shift is invisible. For a Pi-hole, it is catastrophic. Your network devices are configured to send their DNS queries to a specific numerical address (e. g., 192. 168. 1. 50). If your Pi-hole reboots and the router reassigns it to 192. 168. 1. 51, every device on your network continue screaming queries into the void at the old address. The result is an immediate, total internet blackout for every connected client until their configuration is manually updated or their own leases renew.
To prevent this, you must enforce a Static IP. This ensures your Pi-hole resides at a fixed location that never changes, regardless of reboots, power outages, or router firmware updates. There are two methods to achieve this: Router-side DHCP Reservation and Device-side Static Configuration.
Method 1: Router-Side DHCP Reservation (The Control Plane)
The most strong method for modern networks is to configure the static IP on the router itself. This is frequently called “DHCP Reservation” or “Static Lease.” In this configuration, the Pi-hole device requests an IP via DHCP as usual, the router recognizes its MAC address (Media Access Control) and forces the assignment of the same specific IP every single time.
This method is superior because it centralizes network management. If you ever change your network subnet (e. g., moving from 192. 168. 0. x to 10. 0. 0. x), you only need to update the router settings, not the Pi-hole itself.
Implementation Steps
- Identify the MAC Address: SSH into your Pi-hole and run the command
ip link show. Look for theethervalue undereth0(for wired) orwlan0(for Wi-Fi). It look likeb8: 27: eb: xx: xx: xx. - Access Router Interface: Navigate to your router’s gateway IP (commonly
192. 168. 1. 1or192. 168. 0. 1) in a browser. - Locate DHCP Settings: Find the section labeled “LAN Setup,” “DHCP Server,” or “Address Reservation.”
- Create Reservation: Input the Pi-hole’s MAC address and your desired IP address. Ensure this IP is outside the router’s DHCP pool range to prevent conflicts (e. g., if the pool is
. 100to. 200, assign the Pi-hole to. 10).
Method 2: Device-Side Configuration (The Hardline)
If your router is ISP-supplied hardware with locked features, you must configure the static IP directly on the Raspberry Pi. This creates a “hardline” configuration where the device ignores the router’s offers and asserts its own IP.
serious WARNING: The method for setting a static IP changed fundamentally with the release of Raspberry Pi OS “Bookworm” in October 2023. Older guides referencing /etc/dhcpcd. conf are obsolete for new installations and fail.
For Raspberry Pi OS Bookworm (2023-2026)
Newer versions of the OS use NetworkManager. You must use the nmcli (Network Manager Command Line Interface) tool. Editing text files manually is no longer the correct procedure.
, identify your connection name:
nmcli connection show
You see a name like "Wired connection 1" or "preconfigured". Use that name in the following command to set your IP (replace variables with your network details):
sudo nmcli connection modify "Wired connection 1" ipv4. addresses 192. 168. 1. 50/24 ipv4. gateway 192. 168. 1. 1 ipv4. dns 192. 168. 1. 1 ipv4. method manual
Breakdown of flags:
ipv4. addresses: The static IP you want, followed by the subnet mask (/24is standard for 255. 255. 255. 0).ipv4. gateway: Your router’s IP address.ipv4. dns: The initial DNS server the Pi itself use ( the router).ipv4. method manual: Tells the OS to stop asking the router for an IP.
Apply the changes by cycling the interface:
sudo nmcli connection down "Wired connection 1" && sudo nmcli connection up "Wired connection 1"
For Raspberry Pi OS Bullseye (Legacy)
If you are reusing an older SD card or specifically installed the legacy OS, you must use the dhcpcd method.
Edit the configuration file:
sudo nano /etc/dhcpcd. conf
Scroll to the bottom and append the following lines:
interface eth0
static ip_address=192. 168. 1. 50/24
static routers=192. 168. 1. 1
static domain_name_servers=1. 1. 1. 1
Save with CTRL+O, exit with CTRL+X, and reboot.
The IPv6 Complication
IPv6 addresses introduce significant instability if mismanaged. Unlike IPv4, where a device has one address, an IPv6-enabled device have multiple: a Link-Local address (starting with fe80::) and a Global Unicast Address (starting with 2000::).
Global addresses frequently change based on the ISP’s prefix delegation, making them unsuitable for a static DNS configuration. If you hardcode a Global IPv6 address into your router’s DNS settings, and your ISP rotates your prefix, your IPv6 DNS resolution break.
The Solution: Use the Link-Local (fe80) address. This address is derived from the device’s MAC address and remains static on the local network segment. When configuring clients or your router to use the Pi-hole for IPv6 DNS, input the Pi-hole’s fe80::... address. This ensures stability even if the ISP changes the global prefix.
Verification and Fail-Safe Testing
After applying these settings, verification is mandatory. A misconfigured static IP can result in an IP conflict, where two devices fight for the same address, causing packet loss for both.
| Test | Command | Success Criteria |
|---|---|---|
| IP Verification | ip a show eth0 |
Output matches your assigned static IP (e. g., 192. 168. 1. 50). |
| Gateway Reachability | ping -c 4 192. 168. 1. 1 |
0% packet loss. Latency under 2ms. |
| DNS Resolution | dig google. com @127. 0. 0. 1 |
Returns an answer section with an IP address. |
| Route Check | ip route |
“default via” points to your router IP. |
If you lose SSH access after applying these settings, you have likely configured the wrong gateway or a subnet mismatch. To recover, you must physically connect a keyboard and monitor to the Pi-hole to correct the configuration locally using nmtui (a visual interface for NetworkManager) or by reverting the changes in /etc/dhcpcd. conf.
Router-Level DNS Redirection and DHCP Lease Renewal
The method of Network-Wide Blocking
Configuring your router to use Pi-hole is the most method to secure your entire network. Instead of manually adjusting the DNS settings on every phone, laptop, and smart fridge, you change a single setting on the central node: the router. This forces every connected device to route its DNS queries through your Pi-hole.
You must distinguish between two different DNS settings found in router interfaces: WAN DNS and LAN/DHCP DNS.
- WAN DNS (Internet Settings): This controls which DNS server the router itself uses. If you set this to your Pi-hole, the router acts as a middleman. Your Pi-hole logs show all traffic originating from the router’s IP address (e. g., 192. 168. 1. 1) rather than individual devices. This obscures which client is visiting which site, rendering per-client blocking and auditing impossible.
- LAN/DHCP DNS (Local Network Settings): This is the correct target. This setting instructs the router to tell every connected device, “Use the Pi-hole’s IP address for DNS.” When configured here, devices query the Pi-hole directly. Your logs correctly identify
iPhone-15,Work-Laptop, andSamsung-TVas separate entities.
Configuring the Router (The LAN Method)
Access your router’s administration panel (commonly 192. 168. 1. 1 or 192. 168. 0. 1). You must have already assigned a static IP address to your Pi-hole (e. g., 192. 168. 1. 50). If the Pi-hole’s IP changes, your entire network lose internet access immediately.
Navigate to the DHCP or LAN setup section. The terminology varies by manufacturer, the objective is identical: define the DNS Server that the DHCP server assigns to clients.
| Manufacturer | Typical Menu route | serious Notes |
|---|---|---|
| Asus | LAN > DHCP Server > DNS and WINS Server Setting | You must disable “Advertise router’s IP to user-specified DNS.” If left enabled, ads leak through the router’s own fallback. |
| TP-Link | Advanced > Network > DHCP Server | Enter Pi-hole IP in Primary DNS. Leave Secondary DNS blank or repeat the Pi-hole IP. |
| Netgear | Basic > Internet > Domain Name Server (DNS) Address | Select “Use These DNS Servers.” Netgear frequently conflates WAN and LAN DNS; verify clients are querying Pi-hole directly after applying. |
| Ubiquiti (UniFi) | Settings > Networks > [Select Network] > DHCP Service Management | Set “DNS Server” to Manual. Enter the Pi-hole IP. |
| Eero | Settings > Network Settings > DNS | Select “Custom DNS.” Eero requires two entries; enter the Pi-hole IP in both fields to prevent leakage. |
The Secondary DNS Trap
A common error is configuring the Pi-hole as the Primary DNS and a public resolver (like Google’s 8. 8. 8. 8) as the Secondary DNS. Users frequently do this believing it provides a “backup” if the Pi-hole fails.
Do not do this.
Network standards do not define “Secondary” as “Emergency Only.” Operating systems like Windows, iOS, and Android frequently query the Secondary DNS solely to test performance or reduce latency. If you list 8. 8. 8. 8 as a secondary option, your devices bypass the Pi-hole at random intervals. Ads appear, and tracking resume. To ensure 100% filtration, the Pi-hole must be the only DNS server available to your clients. If your router requires two fields, enter the Pi-hole’s IP address in both.
The IPv6 Leak
Modern routers frequently broadcast IPv6 DNS details automatically via Router Advertisements (RA) or DHCPv6. Even if you correctly configure the IPv4 DNS to point to your Pi-hole, your smartphone may silently receive an ISP-controlled IPv6 DNS address. The device then prefer this IPv6 route, bypassing your blocklists entirely.
To close this loophole, you have two options:
- Disable IPv6 (Simplest): Turn off IPv6 support on your router’s LAN settings. For most home networks, this has no negative impact on internet usage and guarantees all traffic flows through the IPv4 Pi-hole.
- Configure IPv6 DNS: If you require IPv6, you must find the IPv6 DNS setting in your router and input the Pi-hole’s ULA (Unique Local Address) IPv6 address. This is more complex and prone to configuration errors if the prefix changes.
Workaround for Locked ISP Routers
ISPs frequently supply routers with locked firmware (e. g., Xfinity, AT&T, Sky) that hides DNS settings. If not change the DNS server on your router, you must disable the router’s DHCP server entirely.
Once the router’s DHCP is off, enable the DHCP Server feature inside the Pi-hole web interface (Settings > DHCP). The Pi-hole then take over the job of assigning IP addresses to your devices, and it automatically assign itself as the DNS server. This method bypasses the ISP router’s restrictions completely.
Forcing DHCP Lease Renewal
Saving settings on the router does not instantly update your devices. Network clients hold onto their configuration until their “DHCP Lease” expires, which is 24 hours. To test your setup immediately, you must force a renewal on your clients.
Windows
Open Command Prompt (cmd. exe) as Administrator and run:
ipconfig /release
ipconfig /renew
macOS
The most reliable method is to toggle Wi-Fi off and on. For a terminal-based renewal without disconnecting:
sudo ipconfig set en0 DHCP
(Replace en0 with en1 if you are using Ethernet via a dongle; use networksetup -listallhardwareports to verify).
Linux
Commands vary by distribution, for Debian/Ubuntu systems using NetworkManager:
sudo nmcli networking off && sudo nmcli networking on
Android / iOS
Toggle “Airplane Mode” on for 5 seconds, then off. This forces the Wi-Fi radio to re-associate and request a new lease. Alternatively, select the Wi-Fi network settings and choose “Renew Lease” (iOS) or “Forget Network” and rejoin (Android).
Verification
After renewal, verify the change. On Windows, run ipconfig /all and check the “DNS Servers” line. It should display only your Pi-hole’s IP address. On macOS, check System Settings > Network > Details > DNS. If you see your router’s IP or a public IP like 75. 75. 75. 75, the configuration is incorrect, or the lease has not renewed.
Deploying StevenBlack Unified Hosts for Foundational Ad-Blocking
The Operational Baseline: StevenBlack Unified Hosts
not build a secure network perimeter without a reliable source of threat intelligence. In the context of a Pi-hole, the blocklist is the fuel that powers the engine. Without a curated list of known malicious domains, your Pi-hole is a passive DNS forwarder. The industry standard for this data is the StevenBlack Unified Hosts list. It serves as the default configuration for Pi-hole installations in 2026 because it balances aggressive blocking with high stability. This repository is not a static text file. It is a sophisticated Python-based aggregation project that pulls data from multiple reputable sources, sanitizes the inputs, removes duplicates, and compiles them into a single, file. As of February 2026, the base Unified list approximately 77, 525 unique domains. This number represents the “safe” baseline. It blocks advertisements, trackers, and known malware distribution points without aggressively targeting gray-area content that might disrupt spousal approval or breaking legitimate services.
Deconstructing the Source Data
The strength of the StevenBlack list lies in its provenance. It does not rely on a single curator. Instead, it ingests data from specific, high-maintenance upstream projects. Understanding these sources is necessary for troubleshooting. If a domain is blocked, it originated from one of these lists.
| Source Name | Primary Target | Operational Role |
|---|---|---|
| AdAway | Mobile Advertising | Blocks in-app advertisements on Android and iOS devices. |
| Steven Black | Curated Adware/Malware | The repository maintainer’s own custom additions and exclusions. |
| Malware Domain List | Active Malware | Blocks domains currently hosting malicious payloads. |
| Peter Lowe’s List | Tracking & Privacy | Focuses on server-side tracking scripts and invisible pixels. |
| URLHaus | Malware Distribution | A serious feed from abuse. ch that botnet C2 servers. |
| Dan Pollock | General Ads/Hosts | A long-standing general purpose hosts file for desktop protection. |
Selecting the Correct Variant
The base list is sufficient for general ad-blocking. Yet network administrators require stricter controls. The StevenBlack repository offers “variants” that append specific categories to the base list. These categories include Fake News, Gambling, Pornography, and Social Media. You must choose the variant that matches your household policy. Do not add multiple separate lists if a pre-compiled variant exists. Using a single consolidated URL reduces the processing overhead during updates. Available Variants (2026 Data): * Base Unified: ~77, 000 domains. (Ads + Malware) * Unified + Gambling: ~83, 000 domains. (Adds online casinos and betting sites) * Unified + Porn: ~153, 000 domains. (Adds adult content) * Unified + Fakenews + Gambling + Porn: ~163, 000 domains. (Maximum protection) The jump in domain count when adding the “Porn” extension is significant. This extension nearly doubles the size of the blocklist. You must verify that your specific use case requires this. Blocking adult content via DNS is for accidental clicks easily bypassed by determined users with a VPN or hardcoded DNS settings.
Implementation Strategy
Your Pi-hole comes pre-configured with the base StevenBlack list. If you wish to upgrade to a variant (e. g., to block gambling), you must replace the default URL. not simply “turn on” gambling blocking; you must point the Pi-hole to the specific text file that contains those domains. Step 1: Locate the Target URL Use the raw GitHub links for the variants. Do not use the main repository page. The Pi-hole requires a direct link to the raw text file.
Base List (Default):
https://raw. githubusercontent. com/StevenBlack/hosts/master/hostsBase + Gambling:
https://raw. githubusercontent. com/StevenBlack/hosts/master/alternates/gambling/hostsBase + Porn + Gambling:
https://raw. githubusercontent. com/StevenBlack/hosts/master/alternates/gambling-porn/hosts
Step 2: Update Pi-hole Configuration Navigate to the Pi-hole web interface. 1. Click on Group Management in the sidebar. 2. Select Adlists. 3. In the “Address” field, paste the URL of your chosen variant. 4. (Optional) Add a comment like “StevenBlack Unified + Gambling”. 5. Click Add. 6. Important: Delete the old “Base” list if you added a variant that includes the base. Duplicate lists waste memory and lengthen update times. Step 3: Force a Update The changes do not take effect immediately. You must rebuild the database. This process downloads the new file, parses it, and loads the domains into the FTLDNS engine. Run the following command in your terminal:
pihole -g
Alternatively, click Tools> Update in the web interface. Watch the output logs. Ensure the status shows “OK” to your new URL. If it fails, check your internet connection or the URL syntax.
Visualizing the Protection
The following chart illustrates the of domain blocking provided by the different StevenBlack variants. Note the massive increase in coverage when the Pornography extension is active. var ctx = document. getElementById(‘stevenBlackChart’). getContext(‘2d’); var myChart = new Chart(ctx, { type: ‘bar’, data: { labels: [‘Base Unified’, ‘Unified + Gambling’, ‘Unified + Porn’, ‘Unified + All Extensions’], datasets: [{ label: ‘Blocked Domains (Feb 2026)’, data: [77525, 83723, 153627, 163024], backgroundColor: [ ‘rgba(54, 162, 235, 0. 7)’, ‘rgba(255, 206, 86, 0. 7)’, ‘rgba(255, 99, 132, 0. 7)’, ‘rgba(75, 192, 192, 0. 7)’ ], borderColor: [ ‘rgba(54, 162, 235, 1)’, ‘rgba(255, 206, 86, 1)’, ‘rgba(255, 99, 132, 1)’, ‘rgba(75, 192, 192, 1)’ ], borderWidth: 1 }] }, options: {: { y: { beginAtZero: true, title: { display: true, text: ‘Number of Domains’ } } }, plugins: { title: { display: true, text: ‘StevenBlack Variant Comparison (2026)’ } } } });
The False Positive Reality
No blocklist is perfect. The StevenBlack list is conservative. Yet it occasionally block a legitimate domain. This frequently happens with “tracking” domains that are also required for site functionality. For example, certain Google analytics domains may be required for a specific shopping cart checkout process to load. If a service breaks, do not immediately disable the Pi-hole. Check the Query Log. Look for “Blocked” entries in red that match the timestamp of your failed attempt. If you see a domain like `analytics. google. com` blocked, whitelist it temporarily. The StevenBlack repository is actively maintained. If you find a widespread false positive, open an problem on the GitHub repository. The community resolves these errors within 24 to 48 hours. Your local Pi-hole pick up the fix during its scheduled update ( Sunday night).
Why Not Use Massive Lists?
You encounter lists online promising to block 2 million or 5 million domains. Avoid these. They are frequently filled with dead domains, duplicates, or aggressive blocks that break the internet. A list with 2 million domains does not make you safer than a list with 160, 000 active, verified malicious domains. It only increases the probability of false positives and memory usage. The StevenBlack list focuses on active threats. Quality supersedes quantity in DNS sinkholing.
Automated Maintenance
Pi-hole handles the maintenance of this list automatically. The cron job located at `/etc/cron. d/pihole` triggers a update every Sunday. This ensures your protection evolves as the StevenBlack team adds new malware domains and removes dead ones. You do not need to manually check the GitHub repo. Your only responsibility is to ensure the Pi-hole has internet access to fetch these updates.
Escalating Filtering Rigor with Firebog's Big Blocklist Collection
Escalating Filtering Rigor: The Firebog Strategy
The default Pi-hole installation ships with a single, highly conservative blocklist: the StevenBlack Unified Hosts list. This list, containing approximately 150, 000 domains, is designed for maximum stability and zero false positives. It blocks the most egregious ad servers allows a significant volume of telemetry, tracking pixels, and “acceptable” advertising to pass through your network. To transform your Pi-hole from a passive filter into a hardened privacy appliance, you must expand its database.
The industry standard for this expansion is Firebog. net. This repository does not host lists itself; rather, it curates and categorizes third-party lists based on their stability and maintenance frequency. Understanding Firebog’s classification system is serious to avoiding a broken network.
The Green vs. Blue Protocol
Firebog organizes lists into two primary tiers: Ticked (Green) and Non-Ticked (Blue). Your selection strategy must align with your tolerance for network disruption.
| Category | Description | Risk Profile | Target Audience |
|---|---|---|---|
| Ticked (Green) | Lists with zero or near-zero false positives. These are manually verified to avoid breaking essential services like banking, government portals, or streaming apps. | Low | “Set and Forget” deployments; households with non-technical users. |
| Non-Ticked (Blue) | Aggressive lists that block broad categories of marketing and telemetry. likely to break specific functionality (e. g., “Sponsored” Google Shopping links, newsletter unsubscribes). | High | Power users to actively manage a whitelist. |
Do not blindly import every list available. A common error among new operators is “blocklist stacking”, adding tens of millions of domains under the false assumption that more is better. This practice yields diminishing returns and degrades performance. A Pi-hole with 20 million blocked domains does not browse faster than one with 2 million; it simply breaks more websites and consumes more RAM.
Implementation on Pi-hole v6
With the release of Pi-hole v6 in 2025, the underlying engine (FTL) handles list processing more, the logic remains unchanged. You must feed the ” ” database with text files containing bad domains.
Step 1: Selection. Navigate to Firebog. net. For a strong home network, copy all URLs from the “Ticked” sections of the following categories:
Suspicious, Advertising, Tracking & Telemetry, Malicious.
Step 2: Ingestion. In your Pi-hole dashboard, navigate to Group Management> Adlists. Paste the URLs into the address field. paste multiple URLs simultaneously.
Step 3: Update. Once added, the lists are registered, not active. You must force a database update. Go to Tools> Update and click “Update”.
On a Raspberry Pi Zero 2 W, this process is CPU-intensive. Parsing and de-duplicating 2 million domains may spike the processor usage to 100% for 60, 120 seconds. This is normal. The device is rebuilding a B-tree index of blocked domains. Do not unplug the device during this operation.
The Whitelist Imperative
As you increase blocking rigor, you inevitably block domains required for legitimate user interaction. The most common casualties of the Firebog Ticked lists include:
- Google Shopping Links: Clicking a “Sponsored” product in search results frequently routes through a tracker (e. g.,
googleadservices. com). These fail to load. - Paramount+ and Peacock: These streaming services frequently refuse to play video if specific ad-metrics domains are unreachable.
- Microsoft Outlook Analytics: Enterprise email clients may stall while trying to contact telemetry servers.
Pi-hole v6 introduced Antigravity, a feature allowing you to subscribe to “Allowlists” just as you do blocklists. yet, manual whitelisting remains a weekly task for the administrator. When a family member complains that a site is “down,” check the Query Log immediately. Look for red “Blocked” entries corresponding to the timestamp of the complaint. Whitelisting the domain takes effect instantly, no update required.
Configuring Recursive DNS with Unbound to Bypass Upstream Loggers
The Privacy Deficit of Forwarding
Most Pi-hole installations remain incomplete. Users successfully block advertisements fail to secure their DNS queries. When you configure Pi-hole to forward requests to Google (8. 8. 8. 8), Cloudflare (1. 1. 1. 1), or Quad9, you shift your trust from your ISP to a global technology conglomerate. While these providers claim to respect privacy, the data monetization market is valued at $5. 22 billion in 2025. Your DNS queries constitute a high-fidelity map of your digital life, revealing banking habits, medical conditions, and political affiliations. If a third party resolves your DNS, they possess this map.
To eliminate this vulnerability, you must bypass upstream providers entirely. This requires configuring a recursive DNS resolver. Unlike a forwarding resolver that asks Google “Where is example. com?”, a recursive resolver acts as its own autonomous agent. It queries the Root Nameservers directly, then follows the chain of referrals to the Top-Level Domain (TLD) servers, and contacts the Authoritative Nameservers for the specific domain. This method ensures that no single entity, other than the authoritative server itself, sees the full route of your request.
Installing and Configuring Unbound
The industry standard for a lightweight, validating, recursive, and caching DNS resolver is Unbound. It integrates directly with the Pi-hole FTL (Faster Than Light) engine operates on a separate port to avoid conflict. configure Unbound to listen on port 5335, leaving port 53 open for Pi-hole to handle network traffic.
Execute the following commands to install the package and download the necessary root hints file. The root hints file contains the IP addresses of the 13 logical root servers that anchor the global DNS hierarchy.
sudo apt update
sudo apt install unbound
wget https://www. internic. net/domain/named. root -qO- | sudo tee /var/lib/unbound/root. hints
The default configuration file provided by the package manager is insufficient for a privacy-focused appliance. You must create a dedicated configuration file that optimizes Unbound for the Raspberry Pi Zero 2 W hardware and enforces strict privacy standards. Create the file /etc/unbound/unbound. conf. d/pi-hole. conf:
sudo nano /etc/unbound/unbound. conf. d/pi-hole. conf
Insert the following configuration block. This configuration explicitly disables IPv6 to prevent timeouts on networks without global unicast IPv6 connectivity, enables DNSSEC validation, and sets buffer sizes compliant with 2025 RFC recommendations (RFC 1232) to prevent fragmentation attacks.
| Parameter | Value | Function |
|---|---|---|
| server: | Initiates server block | |
| verbosity | 0 | Disables verbose logging for performance |
| interface | 127. 0. 0. 1 | Listens only on localhost |
| port | 5335 | Avoids conflict with Pi-hole (port 53) |
| do-ip4 | yes | Enables IPv4 |
| do-udp | yes | Enables UDP transport |
| do-tcp | yes | Enables TCP fallback |
| do-ip6 | no | Disables IPv6 to prevent leakage |
| root-hints | “/var/lib/unbound/root. hints” | route to root server list |
| harden-glue | yes | Protects against cache poisoning |
| harden-dnssec-stripped | yes | Rejects stripped DNSSEC data |
| use-caps-for-id | no | Disables 0x20 encoding (compatibility) |
| edns-buffer-size | 1232 | Prevents IP fragmentation |
| prefetch | yes | Refreshes cache before expiration |
| num-threads | 1 | Optimized for Pi Zero 2 W |
| so-rcvbuf | 1m | Increases receive buffer |
Restart the Unbound service to apply these changes:
sudo service unbound restart
Validating DNSSEC and Resolution
Before connecting Pi-hole to Unbound, you must verify that the resolver is functioning correctly. A misconfigured recursive resolver result in a total loss of internet connectivity for all clients. We use the dig tool to test resolution on the specific port 5335.
, test a standard DNS lookup. This confirms Unbound can contact the root servers and resolve a domain:
dig pi-hole. net @127. 0. 0. 1 -p 5335
The output must show a status of NOERROR and an IP address in the ANSWER section. If the status is SERVFAIL, check your configuration file for syntax errors.
, test DNSSEC validation. This is mandatory. DNSSEC ensures that the IP address you receive is the one authorized by the domain owner, preventing “Man-in-the-Middle” attacks where an attacker redirects your traffic to a malicious server. We test this by querying a domain known to have a broken DNSSEC signature:
dig sigfail. verteiltesysteme. net @127. 0. 0. 1 -p 5335
The status must be SERVFAIL. If Unbound returns an IP address (NOERROR), it means DNSSEC validation is failing to block the insecure domain., test a valid DNSSEC domain:
dig sigok. verteiltesysteme. net @127. 0. 0. 1 -p 5335
This must return NOERROR. Only proceed if all three tests pass.
Connecting Pi-hole to Unbound
With Unbound operational, you must instruct Pi-hole to use it as the sole upstream DNS provider. Access the Pi-hole web interface and navigate to Settings> DNS.
Under “Upstream DNS Servers,” uncheck all pre-selected providers (Google, OpenDNS, Quad9). In the “Custom 1 (IPv4)” field, enter:
127. 0. 0. 1#5335
Ensure that the “Use DNSSEC” box in the Pi-hole interface is unchecked. This may seem counterintuitive, Unbound is already handling the validation. Enabling it in Pi-hole adds unnecessary overhead and can cause false positives in the log files.
Performance Expectations: The Warm Cache
New users frequently mistake the initial latency of a recursive resolver for a performance problem. When you query a domain like nytimes. com, Unbound must traverse the globe: Root ->. com TLD -> nytimes Authoritative. This can take 200ms to 500ms. A forwarding resolver like Cloudflare has likely already cached this answer from another user, delivering it in 15ms.
Yet, this comparison is flawed. Unbound builds a local cache on your Pi Zero 2 W. The second time you (or any device on your network) request nytimes. com, the response comes from your local network in less than 1ms. The prefetch: yes setting in our configuration ensures that Unbound updates frequently accessed records before they expire, keeping your most-used domains in the “warm cache” state. Over a 24-hour period, the perceived speed difference between Unbound and Cloudflare becomes negligible, while the privacy gains remain absolute.
QNAME Minimisation and Privacy
Our configuration includes implicit support for QNAME Minimisation (RFC 9156), which is enabled by default in modern Unbound versions. In a standard DNS lookup, the full query video. google. com is sent to the Root server, then to the. com server, and so on. This leaks your specific destination to every server in the chain.
With QNAME Minimisation, Unbound sends only the minimal necessary information. It asks the Root server for com, the. com server for google. com, and only the Google server for video. google. com. This protocol drastically reduces the data leakage footprint of your recursive lookups, ensuring that top-level registries do not harvest granular data on your browsing habits.
Warning: Do not configure your router to use Unbound directly. Your router must point to the Pi-hole IP address (port 53), which then forwards to Unbound (port 5335). Bypassing Pi-hole eliminates ad-blocking capabilities.
Constructing Whitelist Protocols to Mitigate Service Disruptions
The Diagnostic Loop: The Tail Command
When a service fails, whether it is a spouse’s inability to click a “Sponsored” search result or a broken banking login, you must identify the specific domain responsible. Guesswork is inefficient. The Pi-hole interface offers a “Query Log,” for real-time diagnosis, the command line interface (CLI) provides superior granularity. You must use the FTL (Faster Than Light) tail command. This streams DNS queries to your terminal in real-time.
pihole -t
Execute this command via SSH. The terminal populate with a scrolling waterfall of DNS requests. `Block` events appear in red; `Forwarded` (allowed) events appear in green. The Protocol for Identification: 1. Open the broken application or website on the client device. 2. Run `pihole -t` on your Pi-hole terminal. 3. Trigger the specific action that fails (e. g., clicking the “Buy” button or starting the video stream). 4. Watch the terminal for the immediate flush of red lines. 5. Identify the domain blocked at the exact second of failure. For instance, if Paramount+ loads the interface refuses to play video, you frequently see a block for `tags. tiqcdn. com` or `cbsinteractive. hb. omtrdc. net`. These are not video hosts; they are analytics collectors. yet, the application logic requires a successful “handshake” with these trackers before it releases the video stream. You must whitelist them to restore service.
The Syntax of Permissiveness: v6 Command Structure
As of Pi-hole v6 (standardized in early 2026), the command line syntax has shifted from the legacy flags to more semantic verbs. While `pihole -w` remains compatible in distributions, the authoritative command structure is `pihole allow`. To whitelist a specific domain, use:
pihole allow domain. com
This adds the domain to your database and restarts the DNS resolver. yet, modern content delivery frequently utilizes subdomains (e. g., `ads-1. example. com`, `ads-2. example. com`). Whitelisting these one by one is a losing battle. You must use Regular Expressions (Regex). Regex Whitelisting: To allow a domain and all its subdomains, not simply use a wildcard in the standard allow command. You must construct a regex filter.
pihole allow –regex ‘(.|^)example. com$’
This string tells the FTL engine to permit `example. com` (the `^` start anchor) and any string preceding it separated by a dot (`.`). This is the only method for handling services like Google or Microsoft, which rotate through thousands of subdomains.
The Google Shopping Paradox
The most common user complaint in a Pi-hole environment involves Google Shopping. When a user searches for a product (e. g., “running shoes”) on Google, the top results are “Sponsored” carousel items. These are not direct links to the merchant. They are redirects routed through Google’s ad services to track the click attribution. Pi-hole correctly identifies `www. googleadservices. com` as an ad tracker and blocks it. Consequently, clicking any product in the Google Shopping carousel results in a “This site can’t be reached” error. You face a binary choice: 1. Maintain Privacy: Train users to scroll past the carousel to the “organic” search results. 2. Restore Convenience: Whitelist the tracker, acknowledging that you are permitting Google to track that specific click data. If you choose convenience, you must whitelist the following domains. Note that this does not unblock banner ads on third-party sites (which come from `doubleclick. net`), it does allow the search result redirection to function.
| Service | Primary Blocked Domain | Function Restored |
|---|---|---|
| Google Shopping | www. googleadservices. com | Sponsored search links / Shopping tab redirects |
| Google Analytics | click. google-analytics. com | Email newsletter links frequently route through here |
| YouTube History | s. youtube. com | Restores “Watch History” saving on clients |
| Microsoft Teams | self. events. data. microsoft. com | Fixes status updates and file saving errors |
| Paramount+ | tags. tiqcdn. com | Video playback initialization |
| Spotify | spclient. wg. spotify. com | Podcast playback and “Wrapped” data syncing |
Segmented Whitelisting via Group Management
A “one-size-fits-all” blocking policy is frequently the cause of household friction. A strict blocklist appropriate for a server VLAN render a teenager’s iPad unusable. Pi-hole v6 enhances the “Group Management” feature, allowing you to apply different blocking rules to different devices. You should construct a “High Availability” group for devices that require fewer restrictions (e. g., a spouse’s phone or a work laptop). The Configuration Protocol: 1. Identify Clients: Navigate to the “Clients” tab in the web interface. Map the MAC addresses or static IPs of the sensitive devices. 2. Create a Group: Create a new group named “Partial-Bypass”. 3. Assign Adlists: Assign only the “serious Malware” blocklists to this group, omitting the aggressive “Tracking” or “Social Media” lists. 4. Assign Whitelists: apply a specific whitelist domain only to the “Partial-Bypass” group. For example, if you block Facebook globally a family member requires Instagram for work, whitelist `instagram. com` and `cdninstagram. com` and assign that whitelist entry only to the “Partial-Bypass” group. The rest of the network remains protected from Meta’s tracking pixel, while the specific client retains access.
Handling False Positives in Enterprise Tools
Work-from-home environments in 2026 rely heavily on Microsoft 365 and Zoom. These suites are aggressive with telemetry. Microsoft, in particular, uses domains like `mobile. pipe. aria. microsoft. com` and `browser. pipe. aria. microsoft. com` to siphon usage data. Blocking these domains improves privacy without breaking the application. yet, `self. events. data. microsoft. com` is a frequent exception. Blocking this specific domain can cause Microsoft Teams to loop during login or fail to update the “Presence” status (e. g., changing from “Away” to “Available”). If you encounter “connectivity” warnings in Windows 11 or Windows 12, check for blocks on `www. msftncsi. com` (Microsoft Network Connectivity Status Indicator). Windows uses this simple text file check to determine if it has internet access. If Pi-hole blocks it, the OS may report “No Internet” even if the connection is perfect, preventing Windows Update and the Microsoft Store from functioning.
The Maintenance Discipline
Do not blindly copy “Mega Whitelists” found on GitHub. Whitelisting is a security hole you open intentionally. Every domain you add to the allow list permits traffic to bypass your filter. The correct method is reactive, not proactive. Start with a strict blocking policy. Wait for a service to break. Verify the breakage via `pihole -t`. Whitelist only the specific domain required to restore functionality. If a service requires `ads. roku. com` to function, you must decide if the content on that Roku is worth the tracking cost. Frequently, the answer is yes, the decision must be conscious. Periodically audit your whitelist. Services change their domains. A regex you added in 2024 for a specific streaming service might be obsolete in 2026, leaving a permanent opening in your DNS firewall. Use the command `pihole-FTL sqlite3 /etc/pihole/. db “SELECT domain FROM domainlist WHERE type=0″` to dump your current whitelist for review. Remove any entry not justify.
Engineering Regex Filters for Sophisticated Tracker Neutralization
The Failure of Static Blocklists
Standard ad-blocking relies on. This is the internal term Pi-hole uses for its primary database of blocked domains. is static. It requires a known list of exact domain names to function. If an advertiser registers ads-server-001. example. com today and you update your lists, you are protected. When they switch to ads-server-002. example. com tomorrow, your protection fails until the list maintainer catches up. This game of whack-a-mole is mathematically impossible to win against automated domain generation algorithms (DGA).
You must implement heuristic filtering. Regular Expressions (Regex) allow you to define patterns rather than specific addresses. A single well-engineered regex filter can neutralize thousands of unlisted subdomains instantly. This shifts your defense posture from reactive to proactive. You no longer wait for a blocklist update. You define the rules of engagement for your network infrastructure.
FTLDNS and POSIX ERE Architecture
The Pi-hole FTL (Faster Than Light) engine handles DNS resolution and filtering. It does not use the slow, Perl-compatible regular expressions (PCRE) found in high-level programming languages. Instead, it utilizes POSIX Extended Regular Expressions (ERE). This distinction is important for performance. FTL compiles these expressions when the service starts. It optimizes the matching process to ensure that adding complex filters does not introduce perceptible latency to your DNS resolution.
Benchmarks on a Raspberry Pi Zero 2 W show that FTL can process DNS queries against a set of 50 optimized regex filters in microseconds. The engine evaluates regex filters only after checking the whitelist and the exact-match database. This hierarchy preserves speed. Your regex filters act as the final goalkeeper. They catch what the static lists miss.
Constructing the Kill Chain: Syntax and Logic
You must write code. A poorly written regex can consume excessive CPU pattern. You must use anchors to bound your searches. The caret ^ anchors the match to the start of the string. The dollar sign $ anchors it to the end. Without these, the engine searches every character position in the domain string. This is wasteful.
The following table outlines the essential syntax for FTLDNS filters.
| Symbol | Function | Operational Context |
|---|---|---|
^ |
Start Anchor | Forces the match to begin at the character. Prevents mid-string false positives. |
$ |
End Anchor | Forces the match to end at the last character. Essential for exact TLD matching. |
. |
Wildcard | Matches any single character. Use . to match a literal dot. |
* |
Quantifier | Matches the preceding element zero or more times. |
+ |
Quantifier | Matches the preceding element one or more times. |
| |
Alternation | Acts as a logical OR. Matches either the expression before or after the bar. |
() |
Grouping | Groups characters or expressions together for quantifiers or alternation. |
Target 1: Neutralizing Mobile Analytics
Mobile applications are the primary source of high-frequency tracking queries. Apps frequently phone home to subdomains containing “telemetry” or “analytics” regardless of user consent settings. A static list cannot cover every variation of metrics-us-east. vendor. com. You need a regex that the keyword itself while respecting domain structure.
The following filter any domain containing “telemetry” as a distinct component. It uses a non-greedy match to handle subdomains safely.
^(.+[-_.])?? telemetry[-_.]
This pattern breaks down as follows. The ^ anchors the start. The group (.+[-_.])?? looks for an optional prefix of characters followed by a separator (dash, show, or dot). The ?? makes this quantifier lazy. It stops matching as soon as it finds the keyword., telemetry[-_.] ensures the word “telemetry” is followed by a separator or the end of the string. This blocks telemetry. example. com and app-telemetry. example. com allows telemetry-science. org if legitimate.
Target 2: The Smart TV Ecosystem
Smart TVs and streaming sticks are notorious for aggressive ad insertion and usage tracking. Roku and Samsung devices generate thousands of queries daily to log viewing habits. These domains frequently rotate. A targeted regex strategy is necessary to sever this link without breaking the streaming functionality.
For Roku devices, the log domains follow a predictable pattern. Use this filter to silence them:
^logs?. roku. com$
For Samsung Tizen OS, the ad ecosystem is more complex. The following regex the primary ad delivery subdomains used by the interface:
^samsungads. com$|^samsungacr. com$|^log-config. samsungacr. com$
You must verify these blocks. aggressive devices refuse to launch apps if they cannot contact a time server or a connectivity check domain. Never block time. nists. gov or similar NTP pools via regex.
Target 3: Social Media Containment
Social media platforms use CNAME cloaking and vast subdomain networks to track users across the web. TikTok is particularly aggressive. Blocking the main domain is insufficient because the app uses localized CDNs and tracking domains. To completely sever access to TikTok on your network, you require a wildcard regex.
^(.+[-_.])?? tiktok[-_.]
This filter is nuclear. It blocks tiktok. com, analytics. tiktok. com, and ads. tiktok. com. It also blocks tiktokcdn. com. If you only wish to block the tracking pixels while allowing the app to function, the engineering challenge becomes difficult due to encryption. The most method for privacy is the total block.
For Facebook and Meta, the tracking pixels frequently reside on connect. facebook. net. A surgical regex can disable the tracking script injection across third-party websites without blocking the main social network:
^connect. facebook. net$
Deep CNAME Inspection and Regex
Modern trackers use CNAME cloaking to disguise themselves. A website newspaper. com might load a script from track. newspaper. com. In the DNS records, track. newspaper. com is a CNAME (alias) for tracker. thirdparty. com. Older blockers only see the domain and allow it.
Pi-hole FTL v5. 0 and later includes Deep CNAME Inspection. It resolves the entire chain. If tracker. thirdparty. com matches a regex filter, FTL blocks the original request for track. newspaper. com. This happens automatically. You do not need to configure special regex syntax for CNAMEs. Your regex filters apply to every domain in the resolution chain. This feature is serious for blocking ” -party” trackers that are actually third-party data brokers in disguise.
Verification and Debugging
Deploying a bad regex can break the internet for your household. You must test your syntax before adding it to the live database. Pi-hole provides a command-line tool for this purpose. Access your Pi-hole terminal via SSH and use the pihole-FTL command.
To test a regex against a specific domain:
pihole-FTL regex-test "analytics. google. com" "^(.+[-_.])?? analytics[-_.]"
The system return “Match” or “No match”. This confirms your logic. If you suspect a regex is causing false positives, check the FTL logs. Enable regex debugging mode temporarily:
pihole-FTL --config debug. regex true
This writes detailed matching information to /var/log/pihole/FTL. log. Disable this immediately after troubleshooting to prevent log file bloat.
Whitelisting Logic
The whitelist always overrides the blacklist. This applies to regex as well. If you implement a broad block like ^(.+[-_.])?? ad[-_.], you inadvertently block legitimate sites like admin. example. com or admissions. university. edu. You must add these exceptions to the whitelist.
also use regex for whitelisting. If you want to ensure that all subdomains of a specific work-related service are always accessible, regardless of your other blocks, use a whitelist regex:
(.|^)work-service. com$
This ensures that vpn. work-service. com and mail. work-service. com bypass all other filtering logic. This is a safety method. It prevents your aggressive tracking filters from interfering with serious infrastructure.
Performance Impact and Optimization
Do not copy-paste lists of 5, 000 regex filters found on GitHub. This is inefficient. A single regex takes significantly more CPU time to compute than a B-tree lookup in the database. While FTL is optimized, thousands of complex regexes increase DNS latency.
The optimal strategy is a hybrid method. Use the database for the millions of known, static ad domains. Use regex only for the polymorphic,, and pattern-based threats that static lists miss. A healthy Pi-hole setup runs between 10 and 50 regex filters. If you find yourself needing hundreds, you should look for a better static blocklist instead.
The following chart illustrates the processing hierarchy within FTLDNS.
| Priority | Filter Type | Speed | Action |
|---|---|---|---|
| 1 | Exact Whitelist | Fastest | Allow immediately |
| 2 | Regex Whitelist | Fast | Allow immediately |
| 3 | Exact Blacklist ( ) | Fastest | Block immediately |
| 4 | Regex Blacklist | Variable | Block if match found |
| 5 | Upstream DNS | Network Dependent | Forward query |
This hierarchy confirms that a regex block is the last line of defense. It only executes if the domain has not been explicitly allowed or blocked by faster methods. This design ensures that your network remains responsive even with heavy filtering enabled.
Auditing Network Traffic and Identifying Rogue Telemetry
The Query Log as a Forensic Instrument
Most users treat the Pi-hole query log as a simple scoreboard: a list of what was blocked and what was allowed. This view is superficial. In a hardened network environment, the query log functions as a real-time forensic instrument. It reveals the silent, automated conversations your devices hold with external servers, frequently without your consent or knowledge. By 2026, the volume of background telemetry, data transmitted by devices to manufacturers for analytics, profiling, and diagnostics, has eclipsed legitimate user-initiated traffic on home networks.
To audit this traffic, you must move beyond the “blocked” counter and examine the Query Log page with an investigator’s eye. The log provides four serious data points for every request: the timestamp, the requesting client, the query type (A, AAAA, HTTPS, etc.), and the destination domain. A healthy network is relatively quiet when humans are asleep. If your log shows thousands of requests between 3: 00 AM and 5: 00 AM, you have identified a rogue agent on your LAN.
Identifying High-Frequency Telemetry Offenders
The most obvious sign of rogue telemetry is excessive query volume. Poorly designed IoT devices and aggressive operating systems utilize “retry logic” that borders on a denial-of-service attack against your own network. When a tracking domain is blocked, these devices do not accept the refusal; they retry the connection instantly, sometimes dozens of times per second.
Roku and Streaming Sticks: Roku devices are notorious for this behavior. If you block their telemetry domains, a single device can generate 10, 000 to 20, 000 queries in a 24-hour period. You frequently see bursts of traffic to domains such as scribe. logs. roku. com, cooper. logs. roku. com, and track. sr. roku. com. While blocking these protects your privacy, the sheer volume of retries can flood your logs, making it difficult to spot other problem. This is “noise” in your signal intelligence.
NVIDIA and Gaming Hardware: The NVIDIA GeForce Experience software is another frequent offender. It phones home constantly to telemetry. gfe. nvidia. com and events. gfe. nvidia. com. Unlike services that break when telemetry is blocked, the driver updates and game optimization features frequently continue to function even if these specific tracking subdomains are blackholed.
Smart TVs: Samsung and LG televisions are essentially data-harvesting computers with display panels. A Samsung TV aggressively query samsungcloudsolution. com and samsungadhub. com. In 2024 and 2025, investigators found that Smart TVs attempt to bypass local DNS settings entirely if they cannot reach these domains, falling back to hardcoded DNS servers like 8. 8. 8. 8.
Targeted Telemetry Domains by Manufacturer
auditing requires knowing what to look for. The following table lists verified telemetry domains active between 2024 and 2026 that frequently appear in home network logs.
| Device / OS | Primary Telemetry Domains | Behavior When Blocked |
|---|---|---|
| Windows 11 | v10. events. data. microsoft. comsettings-win. data. microsoft. comwatson. telemetry. microsoft. com |
Silent failure. OS continues to function, “Feedback Hub” and diagnostic tools may break. |
| Roku | scribe. logs. roku. comcooper. logs. roku. comaustin. logs. roku. com |
Aggressive retries. Can generate 10k+ queries/day. Device remains functional. |
| Samsung TV | samsungcloudsolution. comsamsungadhub. comlog-config. samsungacr. com |
May attempt to bypass Pi-hole via hardcoded DNS. Smart features generally. |
| NVIDIA | telemetry. gfe. nvidia. comevents. gfe. nvidia. com |
High-frequency retries. GeForce Experience may show connection errors games run fine. |
| Sonos | msmetrics. ws. sonos. comusage. ws. sonos. com |
Moderate retry rate. Blocking stops usage data collection without breaking playback. |
Deep Auditing with FTLDNS and SQLite3
The web interface only shows recent history ( the last 24 hours). To detect long-term patterns or slow-burning data exfiltration, you must query the long-term database directly. Pi-hole stores this data in /etc/pihole/pihole-FTL. db. This SQLite3 database is your historical record of every network transaction.
access this data via the command line to answer complex questions that the dashboard cannot. For example, to identify which client has been the most “chatty” over the last 30 days, run a direct SQL query.
sqlite3 /etc/pihole/pihole-FTL. db "SELECT client, count(client) FROM queries WHERE timestamp> strftime('%s', ' ', '-30 days') GROUP BY client ORDER BY count(client) DESC LIMIT 10;"
This command bypasses the web UI’s limitations and gives you raw data. If a specific IP address (e. g., a smart bulb or a budget security camera) appears at the top of this list with millions of queries, it warrants immediate isolation. also search for specific domains to see when they were contacted. This is useful for malware forensics, if you suspect a device was infected on a specific date, check the logs for new, unfamiliar domains appearing around that time.
Detecting Malware and C2 Beacons
Ad blocking is a convenience; malware blocking is security. Pi-hole can serve as an early warning system for compromised devices. Malware frequently communicates with a Command and Control (C2) server to receive instructions. These communications leave distinct fingerprints in your DNS logs.
Domain Generation Algorithms (DGA): Sophisticated malware avoids using static domains (like evil-hacker. com) because they are easily blocked. Instead, they use algorithms to generate random-looking domains, such as xy7z1-q2. info or a1b2c3d4. net. If you see queries for nonsensical, random alphanumeric strings, this is a high-confidence indicator of a malware infection.
Beaconing: malware “checks in” at precise intervals, every 5 minutes, or exactly once per hour. While legitimate software (like NTP time sync) does this too, a regular connection to an unknown IP address or a non-standard domain is suspicious.
Data Exfiltration via DNS Tunneling: In this scenario, an attacker encodes stolen data into the subdomain itself. You might see queries that look like password123. user-data. attacker. com. The DNS server receives the query (and the stolen data) even if it replies with an error. If you observe unusually long subdomains in your logs, investigate the client immediately.
The “Hard-Coded” DNS Blind Spot
A significant limitation in DNS auditing is the “hard-coded” DNS server. Devices such as the Google Chromecast, Amazon Echo, and certain smart home appliances are programmed to ignore the DNS server provided by your DHCP (your Pi-hole) and force a connection to Google (8. 8. 8. 8) or their manufacturer’s servers.
These devices create a blind spot. Their traffic does not appear in your Pi-hole logs because they are bypassing your Pi-hole entirely. detect this absence of data by cross-referencing your router’s connected device list with your Pi-hole’s active client list. If a device is online shows zero DNS queries in Pi-hole, it is likely bypassing you.
To close this gap, you must implement a firewall rule on your router (NAT redirection) to force all traffic on port 53 back to the Pi-hole. Only then these rogue devices appear in your audit logs, frequently revealing a surprising volume of previously hidden telemetry.
Analyzing HTTPS (Type 65) Queries
In 2020, the HTTPS DNS record type (Type 65) was standardized to speed up secure connections. You may see these appear in your logs alongside standard A (IPv4) and AAAA (IPv6) records. Apple devices, in particular, generate a high volume of these queries.
Do not be alarmed by Type 65 queries; they are a legitimate part of the modern DNS. yet, they can clutter your logs. If you are auditing for a specific threat, filter your view to focus on A and AAAA records, as these represent the actual resolution of a domain to an IP address. The HTTPS record is metadata; the A record is the connection intent.
By regularly auditing your query log and maintaining a strict blocklist for known telemetry offenders, you transform your Pi-hole from a passive filter into an active network monitor. You gain visibility into the behavior of every device you own, ensuring that your hardware serves you, rather than the data brokers.
Troubleshooting FTL Engine Failures and Database Corruptions
The FTL Engine: Heartbeat of the Sinkhole
The FTL (Faster Than Light) engine is the binary daemon that powers Pi-hole. It handles DNS resolution, blocks domains, and logs statistics. When FTL fails, your network does not lose ad-blocking; it loses the ability to resolve domain names entirely. You experience this as a total internet blackout, even though your modem connection remains active. Diagnosing FTL failures requires examining the Linux service status and the specific exit codes generated by the binary.
Check the status of the FTL service immediately if resolution stops:
sudo systemctl status pihole-FTL
A healthy system returns active (running). If the status is failed or activating (auto-restart), the engine is crashing. The most frequent cause in 2026 remains a port conflict. The DNS protocol demands exclusive access to port 53. On Ubuntu and Debian distributions, a local stub resolver named systemd-resolved frequently seizes this port before Pi-hole can start. The FTL log at /var/log/pihole/FTL. log report: FTL failed to start due to failed to bind to port 53.
Resolving Port 53 Conflicts
You must disable the operating system’s default stub resolver to free the port for Pi-hole. This is a permanent configuration change.
Step 1: Identify the process holding the port.
sudo ss -tulpn | grep: 53
Step 2: If systemd-resolved is the culprit, edit its configuration file.
sudo nano /etc/systemd/resolved. conf
Change the line #DNSStubListener=yes to DNSStubListener=no. Remove the hash symbol to uncomment the line. Save the file and restart the service.
sudo systemctl restart systemd-resolved
This action stops the OS from hoarding port 53. then restart FTL with sudo systemctl restart pihole-FTL.
Database Corruption and Recovery
Pi-hole relies on two SQLite databases: . db (stores blocklists and domains) and pihole-FTL. db (stores long-term query history). These files reside in /etc/pihole/. Sudden power loss, pulling the plug without a shutdown command, frequently corrupts these files. The FTL engine cannot write to a malformed database and crash or lock up.
Diagnosing Corruption
Symptoms of a corrupted . db include empty blocklists, zero domains being blocked, or the web interface showing “Lost Connection to API.” Run an integrity check to confirm damage.
sqlite3 /etc/pihole/. db "PRAGMA integrity_check;"
If the output is anything other than ok, the database is broken. The repair method involves forcing Pi-hole to rebuild the database from scratch using the source lists.
pihole -g -r
Recovering Long-Term Statistics (pihole-FTL. db)
The long-term database grows significantly larger than. Corruption here manifests as “Database is locked” errors in the logs or gaps in the query history graphs. If the PRAGMA integrity_check fails for pihole-FTL. db, you have two options: start fresh or attempt a surgical recovery.
Option A: The Fresh Start (Recommended for Stability)
This method deletes the history restores system stability immediately.
sudo systemctl stop pihole-FTL
sudo mv /etc/pihole/pihole-FTL. db /etc/pihole/pihole-FTL. db. old
sudo systemctl start pihole-FTL
Option B: The Surgical Recovery
If you must retain historical data, use sqlite3 to dump the valid data into a new file. This process can take hours on a Raspberry Pi Zero due to I/O limitations.
sudo systemctl stop pihole-FTL
sqlite3 /etc/pihole/pihole-FTL. db ". dump" | sqlite3 /etc/pihole/pihole-FTL_recovered. db
sudo mv /etc/pihole/pihole-FTL_recovered. db /etc/pihole/pihole-FTL. db
sudo systemctl start pihole-FTL
Rate Limiting vs. Engine Failure
Users frequently mistake Rate Limiting for a crash. FTL includes a safety method to prevent a single rogue client from flooding the network with DNS requests. The default limit in Pi-hole v6 (configured via pihole. toml) and v5 (pihole-FTL. conf) is 1000 queries per 60 seconds. If a device exceeds this, FTL stops answering that specific client.
The log file show:
Rate-limiting 192. 168. 1. 15 for at least 60 seconds
Do not disable this feature blindly. A device making 1000 requests a minute is infected with malware or stuck in a retry loop. Investigate the client. If the traffic is legitimate (e. g., a heavy-duty monitoring server), adjust the limit in /etc/pihole/pihole. toml (v6) or /etc/pihole/pihole-FTL. conf (v5).
Common FTL Error Codes
The following table details specific exit codes and log messages found in /var/log/pihole/FTL. log.
| Error Message / Code | Meaning | Corrective Action |
|---|---|---|
bind: Address already in use |
Port 53 is occupied by another process. | Disable systemd-resolved or remove conflicting DNS software (bind9, dnsmasq). |
database disk image is malformed |
SQLite database structure is corrupted. | Run integrity check and replace/rebuild the DB file. |
database is locked |
Write operation timed out; I/O bottleneck. | Check SD card health; upgrade to High Endurance card; reduce logging level. |
shm_open: Permission denied |
Shared memory access failure (common in Docker). | Verify /dev/shm permissions or Docker --shm-size settings. |
FATAL: Memory allocation failed |
RAM exhausted. | Increase swap size or reduce blocklist size ( ). |
Storage I/O and Database Health
The reliability of the FTL engine is directly tied to the storage medium. Standard SD cards degrade rapidly under the constant write load of the FTL database. The chart illustrates the correlation between storage type and database corruption incidents over a 12-month operational period.
Database Corruption Incidents (12-Month Period)
Generic SD Card
High Endurance SD
USB SSD Boot
*Data reflects average failure rates in 24/7 logging environments. Generic cards frequently fail during WAL (Write-Ahead Log) checkpoints.
If you encounter persistent “database is locked” errors even after a repair, your SD card is likely entering a read-only failure state. Replace the hardware immediately. Do not attempt to repair the software on a dying card; the corruption return within hours.
Final Security Hardening and Backup Restoration Procedures
Network Perimeter Defense and Firewall Configuration
A Pi-hole sitting on your network is a server. Like any server, it requires a firewall to reject unauthorized traffic. The Raspberry Pi OS does not enable a firewall by default. You must install and configure the Uncomplicated Firewall (UFW) to close attack vectors. This is mandatory if you run other services on the same device or if your network perimeter is breached.
Execute the following commands to install UFW and set the default policies to deny all incoming connections while allowing outgoing traffic. This ensures that only explicitly permitted traffic can reach your Pi-hole.
sudo apt install ufw
sudo ufw default deny incoming
sudo ufw default allow outgoing
You must open specific ports to allow DNS resolution and administrative access. Failure to open Port 22 before enabling the firewall lock you out of SSH.
| Port | Protocol | Service | Direction |
|---|---|---|---|
| 22 | TCP | SSH (Remote Access) | Allow In |
| 53 | TCP/UDP | DNS (Resolution) | Allow In |
| 80 | TCP | HTTP (Web Interface) | Allow In |
| 67 | UDP | DHCP (If enabled) | Allow In |
| 4711 | TCP | FTL API (Localhost) | Deny External |
Apply these rules using the command line. For the FTL API on port 4711, the default deny policy handles it, explicitly deny it for clarity. Once the rules are staged, enable the firewall.
sudo ufw allow 22/tcp
sudo ufw allow 53
sudo ufw allow 80/tcp
sudo ufw enable
The Open Resolver Threat
WARNING: Never forward Port 53 from your router’s WAN interface to your Pi-hole. Doing so creates an “Open Resolver.” This allows anyone on the internet to use your bandwidth for DNS Amplification Attacks. Security researchers and malicious actors scan the entire IPv4 address space for open resolvers. If your Pi-hole is exposed, your ISP likely terminate your service for participating in Distributed Denial of Service (DDoS) attacks.
Operating System Hardening
The default user “pi” is a known target for brute-force attacks. You must disable password authentication for SSH and rely exclusively on cryptographic keys. Generate an Ed25519 key pair on your client machine and copy the public key to the Pi-hole.
ssh-keygen -t ed25519
ssh-copy-id pi@192. 168. x. x
Once you verify key-based login works, edit the SSH configuration file at /etc/ssh/sshd_config. Set PasswordAuthentication to no and PermitRootLogin to no. Restart the SSH service to apply these changes.
Automated Security Patching
Manual updates are prone to human error and delay. Install the unattended-upgrades package to ensure your operating system receives serious security patches automatically.
sudo apt install unattended-upgrades
sudo dpkg-reconfigure --priority=low unattended-upgrades
This configuration ensures that security updates for the underlying Linux OS are applied without intervention. Note that this does not update the Pi-hole software itself. You must still run pihole -up manually to review changelogs before upgrading the core application.
Backup Strategies and Restoration
SD cards fail. It is not a matter of if, when. A strong backup strategy involves two: configuration backups and full system images.
1: Teleporter Configuration Backup
Pi-hole includes a utility called Teleporter. This tool exports your whitelists, blacklists, local DNS records, and CNAME configurations into a single compressed archive. generate this backup via the web interface under Settings> Teleporter or via the command line.
pihole -a -t
This command creates a . tar. gz file in the current directory. Script this command to run weekly via cron and move the resulting file to a network-attached storage (NAS) location. This file allows you to restore your blocking rules to a fresh Pi-hole installation in minutes.
2: Full System Imaging
Teleporter does not back up the operating system, network configurations, or Unbound settings. To preserve the entire state of the node, you must create a block-level image of the SD card. Shut down the Raspberry Pi and remove the SD card. Insert it into a card reader on your primary computer.
Use tools like Win32DiskImager (Windows) or dd (Linux/macOS) to read the SD card content into a single . img file. Perform this operation monthly or after significant configuration changes.
Disaster Recovery Procedure
When a failure occurs, follow this restoration hierarchy.
Scenario A: Corrupted Database or Bad Update.
If the OS is functional Pi-hole is erratic, reinstall Pi-hole using the repair flag: pihole -r. Select “Repair” to retain existing settings. If this fails, use the Teleporter function in the web interface to restore your lists from the last known good backup.
Scenario B: SD Card Failure.
Flash a new high-endurance SD card with the latest Raspberry Pi OS. Install Pi-hole and Unbound from scratch. Once the fresh installation is active, navigate to Settings> Teleporter and upload your . tar. gz backup file. This restores your custom DNS records and blocklists immediately. Alternatively, if you possess a full system image, flash that image directly to the new card to return the system to its exact previous state.
