iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Choose a router that can advertise a custom DNS server through its LAN DHCP settings. That lets every normally connected device receive your Pi-hole or other filtering resolver automatically. A router’s WAN DNS field is different: it controls the router’s own upstream lookups, not necessarily the DNS address given to clients.
Before buying, verify the exact hardware revision and firmware for IPv4 and IPv6 DNS distribution, client DNS-over-HTTPS controls, support for your chosen filtering host, and a workable fallback if the built-in DHCP server cannot advertise a custom DNS address.
What the router must do
Network-wide DNS filtering depends on where clients learn their DNS server. In the usual separate-host design, Pi-hole runs on a computer with a stable address on your LAN. The router’s DHCP service then tells phones, computers, televisions and other clients to send DNS queries to that address. Pi-hole resolves permitted names through its upstream resolver and answers blocked names according to its lists.
This arrangement avoids configuring every device individually, but it applies only to clients that accept the router’s DHCP information and continue using the supplied resolver. It is a distribution mechanism, not an absolute enforcement system.
LAN DHCP DNS and WAN DNS are different
Look for a setting under labels such as LAN, DHCP Server, Network or Local network that lets you enter one or more DNS addresses offered to clients. That is the setting needed for a separate Pi-hole.
A field under Internet, WAN or DNS privacy usually configures the resolver used by the router itself or by its upstream connection. Changing it to a public resolver does not make that resolver a filtering service, and it does not prove that LAN clients will receive the same address.
Filtering, encryption and enforcement are separate features
- Filtering: a DNS service such as Pi-hole decides which domain names should resolve.
- Encryption: DNS-over-TLS (DoT) or DNS-over-HTTPS (DoH) protects queries in transit to a resolver; encryption alone does not block domains.
- Enforcement: router controls, firewall rules or interception may reduce clients’ ability to bypass the advertised resolver. Ordinary DHCP DNS does not guarantee this.
Router-selection checklist
Use the following checks against the exact model, hardware revision, regional edition and firmware you intend to buy. Feature names and capabilities can change between releases.
1. Custom DNS in LAN DHCP
Confirm that the router can advertise a chosen DNS address to LAN clients. Ideally, it should let you specify both primary and secondary addresses rather than silently replacing your value with the provider’s resolver.
Reserve the filtering host’s address in the router’s DHCP lease table, or configure a static address on the host in a way that does not overlap the DHCP pool. Pi-hole’s hardware guidance requires a static address; a DHCP reservation is an acceptable way to keep the address stable.
2. IPv4 and IPv6 distribution
Do not stop after testing IPv4. Check whether the router sends DNS information through IPv6 router advertisements as well as IPv4 DHCP. A client may receive the filtering address over IPv4 but learn a different resolver over IPv6.
Documentation reviewed for this subject does not establish IPv6 behavior for a particular router model. Read the model’s manual and test on the firmware you will use. If the router cannot advertise your filtering resolver over IPv6, either configure IPv6 deliberately, disable it where appropriate, or use a design that accounts for the alternate path.
Free tools Windows power users keep installed
One-click scans. No signup required.
Rank #2
- All-in-One Complete Kit: This SANOOV RPi 5 bundle comes with Raspberry Pi 5 4GB RAM single board, active cooler, durable ABS case and screwdriver. No extra parts needed, ready to use right out of the box for beginners and hobbyists
- Powerful Single Board Computer: Equipped with 4GB RAM and high-performance processor, delivers fast running speed for 4K playback, AI projects, programming and daily computing tasks. SANOOV for raspberry pi 5 4GB is equipped with broadcom 64 quad-core Arm Cortex A76 processor with gigabit ethernet and upgraded with IEEE 802.11ac Wi-Fi, Bluetooth 5.0 dual-band 2.4Ghz and 5Ghz and Power Over Ethernet (POE). Upgrading delivers 2-3 x speed vs Pi 4, redefining the experience
- Efficient Active Cooler: Effectively lowers operating temperature and prevents performance throttling. Runs quietly even under long-time heavy load, ensures stable operation all day long. SANOOV RPi 5 4GB kit offer an active cooler, which combines an aluminium heatsink with a high-performance PWM fan. Active cooler is fully compatible with the Pi OS, which can effectively reduce the temperature of RPi5 and ensure its good performance during long-term high load operation
- Sturdy ABS Protective Case: Well-fitted for Raspberry Pi 5 board, can be secured with 4 screws to effectively protect the Pi 5 motherboard from damage, reserves full access to all ports and buttons. SANOOV uses ABS material to produce the case, which has a softer texture and feel. Meanwhile, SANOOV case adopts a layered design for easy disassembly and installation. (Tip: The Case cannot install M.2 HAT Add on Board and Solid State Drive!)
- Wide Application & Full Compatibility: Seamlessly compatible with official OS and mainstream peripheral accessories for Raspberry Pi 5. Whether you are a beginner, student, electronics hobbyist or professional developer, this all-in-one kit meets your diverse needs. It excels in IoT projects, robotics design, retro gaming devices, home media servers and other DIY creations. Backed by a large global community, you can easily find guides, technical support and shared projects online
3. Controls for client DoH bypass
Some operating systems, browsers and applications enable DNS-over-HTTPS independently. ASUS support documentation states: “Some clients will automatically switch to DNS over HTTPS, bypassing your preferred DNS servers.” A candidate router may offer a control to prevent certain automatic DoH behavior, but the effect is conditional and depends on the client and router mode.
Ask whether the router can detect or block known DoH endpoints, redirect ordinary port-53 DNS, or apply policies by device. Treat these as additional controls, not proof that every application will obey the filter.
4. Support for your filtering architecture
Decide whether the filtering service will run on separate hardware or on the router itself.
- Separate host: Pi-hole can run on a Raspberry Pi or another compatible Linux system. The router only needs to distribute that host’s address through DHCP.
- On-router service: OpenWrt documents an AdGuard Home integration. This can reduce hardware, but it introduces firmware packages, storage, port assignments and service-order dependencies. Installation alone may not change which address DHCP advertises.
5. Firmware and model-specific requirements
Check the vendor’s documentation for the precise hardware revision and firmware branch. For example, ASUS documents its DoT feature as requiring firmware later than 3.0.0.4.386.4xxxx. That requirement applies to that feature and platform; it is not a general standard for all routers.
Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsAlso check whether the interface differs by region, whether modem-router combinations expose fewer settings, and whether a firmware update can remove or relocate a feature.
6. A DHCP fallback
If the router cannot tell clients to use a custom DNS server, Pi-hole can provide DHCP itself. Pi-hole’s instruction is explicit: disable the router’s DHCP service first. Two active DHCP servers on one broadcast domain can hand out conflicting gateways, addresses and DNS settings.
7. Lease renewal and verification
Clients may retain old DHCP information until their leases expire. Plan to renew leases, disconnect and reconnect Wi-Fi, or restart clients after changing the router. Then inspect the DNS address each device actually received and confirm that queries appear in the filtering service’s logs.
Rank #3
- powful cputhe cpu of the raspberry pi 4 model b adopts the latest arm cortex-a72 architecture, which is also used in high-performance smartphones, and has evolved into a real pc.the operating clock has been changed from pi3's 1.2ghz to 1.5ghz, and the speed has become a different dimension with the updated architecture.
- video output/gputhe on-board gpu of the raspberry pi 4 supports 4kp@60 and newly supports h.265 decoding, opengl es 3.0, etc.as for the video output, two micro hdmis with smaller connectors are installed, and the raspberry pi 4 also supports dual screen output.
- usb 3.0with a new soc, the speed of the raspberry pi 4 around i/o has been improved, and finally usb 3.0 is supported.usb boot is faster and more convenient.
- network&bluetoothgigabit ethernet (wired lan) has also been significantly speeded up from 300mbps of pi 3b + to 1000mbps (logical value).in addition, bluetooth supported version has been upgraded to 5.0, and the transfer speed of pi 4 has been doubled.
- power input connectorthe power input connector of the raspberry pi 4 has been changed to usb type c. it is easier to use than micro usb and can supply a larger current reliably.the power requirement of raspberry pi 4 model b is 5v 3.0a, which is higher than the previous model.
Compare routers with a consistent feature matrix
Do not choose by the presence of a generic “DNS” field. Record the result for every candidate using the same questions.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →| Capability | What to verify | Why it matters |
|---|---|---|
| LAN DHCP DNS | Can you enter the filtering host’s address for clients? | This is the normal way to distribute Pi-hole network-wide. |
| Secondary DNS behavior | Can the router leave the secondary field empty, or does it force another resolver? | A forced alternate may allow lookups to escape the filter when the primary is unavailable. |
| IPv6 DNS | Does DHCPv6 or router advertisement use your filtering address? | Otherwise clients may resolve over an unfiltered IPv6 path. |
| DoH controls | Can the router limit known automatic DoH behavior? | Some clients can bypass DHCP-provided DNS. |
| DNS interception | Can ordinary DNS traffic be redirected or blocked by policy? | This can reduce simple manual bypasses, although encrypted application-specific DNS may remain. |
| Filtering-host support | Are required ports, loopback addresses and static leases configurable? | On-router and separate-host deployments have different dependencies. |
| Firmware maintenance | Are the required options present in the current firmware for your region? | Features vary by release and hardware revision. |
| Recovery path | Can you disable custom DNS or DHCP without losing LAN access? | A clear rollback reduces downtime during testing. |
Setup pattern: separate Pi-hole host with router DHCP
This is the simplest design when the router supports custom LAN DHCP DNS.
Prepare the filtering host
- Install Pi-hole on a supported Linux system, such as a Raspberry Pi running a supported Raspberry Pi OS release, or another compatible host.
- Give the host a stable LAN address. A DHCP reservation on the router is usually easier to manage than a manually assigned address outside the pool.
- Confirm that Pi-hole is listening on the LAN interface and that its administrative interface and DNS service are healthy.
Change the router’s LAN DHCP setting
- Sign in to the router’s administrator interface.
- Open the LAN, Local Network or DHCP Server page, not the Internet/WAN DNS page.
- Enter the Pi-hole address in the client DNS field. If the interface has separate IPv4 and IPv6 sections, configure both only after confirming the addresses and behavior you intend.
- Save or apply the change. Some routers restart the DHCP service or briefly interrupt clients.
Renew clients and test
- Renew the DHCP lease on a computer, reconnect mobile devices to Wi-Fi, or restart clients that do not provide a manual renewal option.
- Inspect the client’s network details and verify that the DNS server is the Pi-hole address, not the router address or a public resolver.
- Open Pi-hole’s query log and generate a few lookups from the client. Confirm that the queries arrive and that a test domain on a block list is handled according to your policy.
- Repeat the check on wired and wireless networks, guest networks and representative operating systems.
Pi-hole describes this pattern as providing blocking to devices on the network without per-device configuration. It still depends on clients accepting DHCP and not selecting another encrypted DNS path.
Setup pattern: let Pi-hole provide DHCP
Use this when the router cannot advertise a custom DNS address to clients.
- Record the router’s current LAN address, DHCP pool, gateway and lease settings so you can restore them if needed.
- In the router interface, disable its DHCP server. Do not leave both services active on the same LAN.
- Enable Pi-hole’s DHCP server and define a non-overlapping address range, gateway and lease duration.
- Renew leases or reconnect clients. They should now receive their address, gateway and Pi-hole DNS information from Pi-hole.
- Verify several clients and confirm that the router remains the default gateway unless your design intentionally changes it.
This workaround changes which device manages local addressing. Keep a written rollback plan and make sure the Pi-hole host starts reliably; if it is powered off, new clients may be unable to obtain network configuration.
Setup pattern: filtering on OpenWrt
OpenWrt documents an AdGuard Home integration for network-wide DNS blocking. Running the service on the router can eliminate a separate computer, but it is more configuration-sensitive than the separate-host pattern.
Check service and port dependencies
DNS services commonly compete for port 53. OpenWrt’s setup notes explain that changing the DNS service can affect dnsmasq and the address advertised to clients. Follow the instructions for your exact OpenWrt release rather than assuming that installing the package automatically changes DHCP.
Rank #4
- Includes Raspberry Pi 4 4GB Model B with 1.5GHz 64-bit quad-core CPU (4GB RAM)
- Includes Pre-Loaded 32GB EVO+ Micro SD Card (Class 10), USB MicroSD Card Reader
- CanaKit Premium High-Gloss Raspberry Pi 4 Case with Integrated Fan Mount, CanaKit Low Noise Bearing System Fan
- CanaKit 3.5A USB-C Raspberry Pi 4 Power Supply (US Plug) with Noise Filter, Set of Heat Sinks, Display Cable - 6 foot (Supports up to 4K60p)
- CanaKit USB-C PiSwitch (On/Off Power Switch for Raspberry Pi 4)
Verify the advertised address
After configuration, inspect a newly renewed client lease. Confirm whether clients should query the router’s LAN address, a dedicated service address or another explicitly configured address. Then check the filtering service’s logs and test from more than one network segment.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.IPv6: the path many setups overlook
IPv6 can create a second DNS path even when IPv4 appears correct. Router advertisements may provide resolver addresses independently of the IPv4 DHCP settings. A device can therefore show the Pi-hole address in one diagnostic screen while sending some queries to an IPv6 resolver learned elsewhere.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Questions to answer before purchase
- Does the router expose IPv6 DNS settings separately from IPv4?
- Can it advertise the chosen resolver through the IPv6 mechanism used by the firmware?
- Can guest and IoT networks receive the same policy?
- What happens when the filtering host is reachable over IPv4 but not IPv6?
Test with a client that has both address families enabled. Record every DNS address it receives and observe the filtering service while generating queries. Do not claim IPv6 coverage until this test succeeds on the firmware you will deploy.
Bypass, privacy and what DNS filtering cannot do
DoH bypass
DHCP supplies a preferred resolver; it does not control every application. A browser or operating system that establishes its own DoH session can avoid the address supplied by DHCP. Router settings that suppress automatic DoH may cover only specified modes or known endpoints, so test the clients that matter to you.
DoT is not a block list
DNS-over-TLS encrypts the connection between a DNS client or router and the configured resolver. ASUS describes its DoT option as sending incoming DNS queries to the configured server and notes that privacy settings can affect general DNS performance. If that server is not configured to filter domains, DoT provides privacy transport without ad or tracker blocking.
DNS filtering is not universal traffic filtering
A DNS filter acts when a client resolves a domain name. It cannot remove every advertisement, block content served from an allowed domain, inspect all IP-address traffic, or guarantee that every tracker is stopped. Describe the result as domain-level filtering for clients that use the resolver.
Recommended Free Tools
Troubleshooting common failures
Clients still show the router as DNS
- Renew the client lease; old DHCP data may still be active.
- Check that you edited LAN DHCP rather than WAN DNS.
- Look for a second DHCP server, access point or mesh node handing out its own settings.
- Inspect the client for manually configured DNS addresses.
Only some devices are filtered
- Compare wired, primary Wi-Fi, guest Wi-Fi and IoT network settings.
- Check whether the missing devices use IPv6 DNS learned through advertisements.
- Look for browser or operating-system DoH settings.
- Confirm that the devices can reach the Pi-hole host and that its service is listening on the LAN address.
Internet access fails after enabling Pi-hole DHCP
- Ensure the router’s DHCP service is disabled, not merely configured with a different range.
- Verify Pi-hole’s gateway value and address pool.
- Renew a lease after correcting the settings.
- Use the router’s documented rollback procedure if the Pi-hole host is unavailable.
Filtering works, but DNS feels slow
Check the selected upstream resolver, the router’s DNS privacy mode and connectivity to the filtering host. Encrypted DNS can add processing or network latency, and privacy settings may affect general DNS performance. Change one variable at a time and observe query response behavior rather than assuming that filtering itself is the cause.
A practical buying decision
Choose a conventional router plus separate host when
- You want Pi-hole’s mature network-wide pattern and are comfortable maintaining a small Linux computer.
- The router has dependable LAN DHCP DNS controls and adequate IPv6 documentation.
- You want to replace or upgrade the router without rebuilding the filtering service.
Choose router-hosted filtering when
- You prefer fewer powered devices and are willing to maintain configurable firmware.
- The router has sufficient storage and memory for the service.
- You have checked service ports, dnsmasq behavior, DHCP advertisement and recovery steps for the exact firmware.
Use Pi-hole DHCP as a fallback when
- The router cannot advertise a custom DNS address.
- You can keep the Pi-hole host reliably powered and reachable.
- You are prepared to disable the router’s DHCP service and take over lease management.
Pre-purchase and post-install checklist
Before buying
- Download the manual for the exact model and hardware revision.
- Locate the LAN DHCP DNS fields and confirm they accept a local address.
- Read the IPv6, router-advertisement and guest-network documentation.
- Check DoH controls, DNS interception options and the firmware requirement for each feature.
- Confirm that your chosen filtering host or on-router service fits the available ports and firmware packages.
- Write down the rollback method and verify that firmware updates will preserve the required settings.
After installation
- Reserve or statically assign the filtering host’s LAN address.
- Configure LAN DHCP DNS, then renew representative clients.
- Record every DNS address received over IPv4 and IPv6.
- Confirm queries in the filtering service’s logs from wired, wireless, guest and IoT segments.
- Test a blocked domain, a permitted domain and a client with DoH enabled.
- Document the final settings so a future firmware update or reset does not silently remove network-wide coverage.
Bottom line
The decisive router feature is not a branded “secure DNS” or “private DNS” label. It is precise control over the DNS server that the router’s LAN DHCP service advertises, together with verified IPv6 behavior and realistic handling of DoH bypasses. Select the router only after checking its exact firmware and model documentation. Then validate the addresses that real clients receive; that test, rather than the presence of a setting on a specification sheet, determines whether your network-wide filter is actually in use.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
