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Some smart devices bypass Pi-hole because their DNS requests never reach it. A device may use a hardcoded resolver, send DNS directly over an encrypted protocol such as DNS over HTTPS (DoH), follow an IPv6 advertisement that points elsewhere, or use a privacy service such as iCloud Private Relay. Encryption itself is not the bypass: Pi-hole can filter a request and then send the approved lookup to an encrypted upstream resolver. The decisive question is always where the device sends its DNS query.
What “bypassing Pi-hole” actually means
Pi-hole is a DNS sinkhole. It evaluates domain requests that are sent to its DNS service, blocks domains on its lists, and forwards permitted requests to an upstream resolver. Installing Pi-hole on a Linux host or a small single-board computer does not automatically force every client on the network to use it. Clients must be directed to Pi-hole through DHCP, IPv6 router advertisements, manual settings, or an equivalent network policy. Pi-hole’s overview and post-install documentation describe this deployment model (overview; post-install guide).
A device has bypassed Pi-hole when its lookup goes to another resolver or service instead of Pi-hole. The request might still be encrypted, but it is outside Pi-hole’s filtering path. Conversely, an encrypted connection from Pi-hole to its upstream provider is not a bypass because Pi-hole has already made the filtering decision.
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| Situation | DNS path | What Pi-hole can do |
|---|---|---|
| Normal network configuration | Smart device → Pi-hole → upstream DNS resolver | Pi-hole sees the client request, applies its blocklists and rules, then forwards allowed lookups. |
| Hardcoded or alternate resolver | Smart device → public DNS service (or another local resolver) | Pi-hole does not see the request and cannot filter it. |
| Client-side encrypted DNS | Smart device or app → its DoH/DoT provider | Pi-hole normally cannot inspect or block the name because the client skipped Pi-hole. |
| Encrypted upstream configured in Pi-hole | Smart device → Pi-hole → encrypted upstream resolver | Pi-hole still filters. Encryption protects the Pi-hole-to-provider leg, while that provider receives the forwarded query. |
Pi-hole’s router guidance warns that some clients and applications use hardcoded DNS servers, allowing them to connect directly to public resolvers. Its OPNsense instructions give Chromecast devices as an example of clients that may have hardcoded DNS (FRITZ!Box guide; OPNsense guide).
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Why a smart TV, streamer or appliance can avoid Pi-hole
Hardcoded DNS addresses
A manufacturer can put a resolver address in firmware or an application can choose one instead of accepting the address supplied by DHCP. Changing the router’s DHCP DNS option then has no effect on that particular lookup. Some devices try a fixed secondary resolver if their preferred server does not answer, so a failure or block on one path can produce a different path rather than a visible error.
DNS over HTTPS or DNS over TLS chosen by the client
DoH wraps DNS inside HTTPS, commonly using TCP port 443; DNS over TLS (DoT) uses an encrypted TLS connection, commonly on port 853. If an appliance, browser component or app creates that connection directly to its chosen provider, the router may see only an ordinary encrypted session. A port-53 rule aimed at conventional DNS does not automatically control these protocols.
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IPv6 points somewhere different
You can correctly advertise Pi-hole for IPv4 and still bypass it over IPv6. Router advertisements and IPv6 DHCP settings can provide a resolver address independently of the IPv4 DHCP configuration. The OPNsense documentation shows separate IPv4 DHCP and IPv6 router-advertisement work for this reason (OPNsense instructions).
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Some operating systems deliberately change the DNS path when a privacy feature is enabled. Apple’s iCloud Private Relay is one example. Other clients use a “canary” domain to detect whether a network is interfering with automatic DoH, or discover a designated resolver through special DNS names. Pi-hole has configuration controls for these named behaviors, but those controls are targeted responses, not a universal switch that intercepts every encrypted-DNS implementation.
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Application-specific networking
A device can use the operating system’s resolver for menus and updates while a streaming, voice or telemetry app uses its own resolver or tunnel. That is why a device may appear in some Pi-hole query records yet still reach domains that never appear there.
What DNS encryption does—and does not—change
Encryption answers a transport question: can someone observing that network leg read or alter the DNS exchange? Routing answers a control question: did the query pass through Pi-hole? They are separate properties.
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- Client-to-Pi-hole, ordinary DNS: Pi-hole can filter, but the local DNS exchange is not encrypted.
- Client-to-Pi-hole, encrypted transport: Pi-hole can still filter if the client is actually configured to use Pi-hole and the encrypted endpoint terminates there.
- Client-to-another DoH/DoT provider: the query is encrypted from local observers, but Pi-hole is skipped.
- Pi-hole-to-upstream encrypted DNS: filtering remains at Pi-hole; encryption protects the upstream leg. The upstream provider still handles the forwarded query.
Pi-hole documents upstream-provider choices and separately documents encrypted-upstream approaches (upstream DNS providers). Its encrypted-DNS guidance notes that the DoH provider can retain visibility of the queries it receives (DNS-over-HTTPS guide). Therefore, “the DNS is encrypted” is not evidence that Pi-hole was bypassed, and “Pi-hole is filtering” is not evidence that every DNS leg is private.
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- Verify the advertised DNS address. In the router’s LAN or DHCP settings, set the DNS server given to clients to Pi-hole’s address. Confirm the setting applies to the relevant network or VLAN, not only to the main LAN. Pi-hole’s post-install guide covers using router DHCP for this purpose (post-install guide).
- Provide a fallback DHCP method when necessary. If the router cannot advertise a custom DNS server, disable its DHCP service and enable Pi-hole’s built-in DHCP server, or configure each client manually. Do not run two competing DHCP servers on the same broadcast network; clients may receive inconsistent settings.
- Configure IPv6 separately. Set the Pi-hole IPv6 address in the router’s IPv6 DNS or router-advertisement settings. Check a client’s actual IPv6 resolver list rather than assuming the IPv4 setting covers it.
- Watch Pi-hole while reproducing the problem. Open Pi-hole’s query records, note the device’s address or hostname, then perform the action that reaches a supposedly blocked domain. If no corresponding request appears, the lookup likely used another resolver, an encrypted client path, a cached answer or an application tunnel. Query records establish what reached Pi-hole; they do not by themselves reveal every request that stayed elsewhere.
- Inspect device and app resolver settings. Look for “Private DNS,” “Secure DNS,” “DNS over HTTPS,” custom network profiles, VPNs and manually entered DNS addresses. Check both the operating-system network page and the individual app, because an app can override the system resolver.
- Check named privacy-discovery controls. Pi-hole’s configuration reference includes options for Firefox’s automatic DoH canary (
use-application-dns.net), Apple Private Relay domains (mask.icloud.comandmask-h2.icloud.com), and Discovery of Designated Resolvers (resolver.arpa). These options address those documented pathways; they do not guarantee interception of every vendor’s encrypted resolver (configuration reference). - Apply enforcement only after identifying the dependency. A router or firewall can restrict conventional DNS to Pi-hole, but test the device first. A hardcoded-DNS appliance may stop working when its alternate server is blocked, especially if it has no fallback. The FRITZ!Box and OPNsense guides both describe this compatibility risk (FRITZ!Box guidance; OPNsense guidance).
- Check for a resolver loop. If the router forwards DNS to Pi-hole, do not configure Pi-hole to use that same router as its upstream when the router forwards requests back to Pi-hole. Choose an independent upstream provider in Pi-hole. Both router guides warn that this arrangement can create a loop (FRITZ!Box guide; OPNsense guide).
Ways to enforce Pi-hole, with their trade-offs
| Method | Enforcement point | Client visibility | Compatibility and coverage |
|---|---|---|---|
| Router DHCP or manual client DNS | Router configuration or each device | Direct clients can remain individually visible in Pi-hole. | Least disruptive, but a hardcoded resolver, IPv6 path or client-side DoH can ignore it. |
| Pi-hole’s DHCP service | Pi-hole supplies leases and DNS settings | Clients use Pi-hole directly when they accept DHCP. | Useful when the router cannot advertise Pi-hole; requires disabling router DHCP and careful network migration. |
| Router/firewall DNS restriction | Firewall redirects or blocks conventional DNS that is not destined for Pi-hole | Depending on implementation, the router may appear as the source of forwarded requests instead of each client; the FRITZ!Box guide documents this visibility trade-off. | Stronger control over ordinary DNS, but can break hardcoded-DNS devices. A basic DNS-port rule does not promise control over DoH, DoT or application tunnels. |
| Special-domain responses | Pi-hole rules for documented discovery or relay domains | Only requests that reach Pi-hole are visible. | Can address named canary, relay and designated-resolver behaviors; it is not a universal encrypted-DNS blocker. |
Choose the least restrictive method that meets your goal. If the priority is reliable appliance operation, start with correct DHCP and IPv6 advertisements and document exceptions. If the priority is preventing clients from selecting arbitrary conventional resolvers, add firewall policy and test every affected device. Treat encrypted-resolver enforcement as a separate design problem rather than assuming that blocking port 53 solves it.
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Using encrypted upstream DNS without losing Pi-hole filtering
When privacy on the upstream leg matters, configure Pi-hole to use a supported encrypted-upstream design. The sequence remains device → Pi-hole → provider: Pi-hole receives the client request, evaluates it, and only then sends an allowed lookup upstream. This protects the connection between Pi-hole and the provider from ordinary network observation, but it does not make the provider blind. The provider must still answer the query and can see the names it receives.
Pi-hole’s provider documentation lists ordinary and custom resolver choices, while its DoH page explains the encrypted-upstream pattern (provider documentation; DoH documentation). Keep the upstream choice independent of the router when the router itself forwards to Pi-hole, or the loop described earlier can prevent resolution.
Important status of the cloudflared proxy-DNS guide
Pi-hole’s current cloudflared DoH page carries a date-sensitive warning: As of November 2025 the proxy-dns feature that this guide relies upon is deprecated by cloudflare.
The page says existing installations continue to work and are supported for 12 months after their release date, but updates after February 2, 2026 will make the guide’s method stop working. It also states: New installations via this method are not recommended.
Those statements apply to that legacy cloudflared proxy-DNS method, not to encrypted DNS as a whole. Because the cutoff and support status are version-dependent, consult the live guide before deploying or updating it (Pi-hole’s cloudflared DoH guide).
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Practical checklist for a stubborn smart device
- Confirm the device’s IPv4 and IPv6 DNS servers, not just the router’s advertised IPv4 value.
- Search Pi-hole query records while reproducing one known blocked-domain request.
- Disable the device’s Secure DNS, Private DNS, VPN or custom resolver temporarily to isolate the cause.
- Check whether the application, rather than the operating system, owns the DNS connection.
- Review Pi-hole’s canary, Private Relay and designated-resolver options only for the named behaviors they cover.
- Before blocking alternate DNS at the firewall, identify whether the device has a documented fallback; otherwise expect connection failures.
- Keep the router’s forwarding path and Pi-hole’s upstream path separate to avoid a loop.
The key distinction to remember
Pi-hole controls requests that arrive at Pi-hole. DHCP and IPv6 advertisements determine where cooperative clients send those requests; hardcoded resolvers, client-side encrypted DNS and privacy relays can choose another destination. Encryption can protect either the client’s connection to its chosen resolver or Pi-hole’s connection to its upstream provider, so it is not, by itself, proof of a bypass. Trace the resolver path first, then select DHCP, special-domain or firewall controls that match the device’s actual behavior.
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