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DNS can run on your router or on a separate server. Your devices send DNS queries to whichever server address they have been configured to use—often an address supplied automatically by DHCP. A router may simply hand out that address, or it may also run a DNS resolver that answers clients and forwards other queries upstream.
What “DNS on the router” can mean
DNS translates names such as a website’s domain into IP addresses. In a typical network, each device has a configured DNS server address. DHCP commonly provides that address along with other network settings, but the DHCP server does not have to be the DNS server: it may advertise the address of the router, a separate internal server, or another resolver.
A router can therefore have two distinct roles: it can distribute DNS settings to clients, and it can run the resolver those clients query. MikroTik’s RouterOS documentation describes a caching DNS resolver on the router that can serve devices on the local network and query upstream DNS servers. That is a router feature, not a capability guaranteed by every router or firmware version. MikroTik RouterOS DNS documentation and RouterOS DHCP documentation explain these separate roles.
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A device sends a query to its configured DNS server; it does not automatically query the router just because the router is the network gateway. The DNS server may answer from a local authoritative zone, return a cached result, or obtain an answer through recursion or forwarding. Microsoft explains these client-to-resolver and resolution paths in its DNS query overview.
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- Router resolver: client → router’s LAN DNS address → local answer, cache, or upstream DNS server.
- Separate DNS server: client → internal DNS server → its local zone or cache, then an upstream forwarder or recursive resolution for other names.
For router-based DNS, the router’s upstream servers may be learned from the internet connection or configured manually. A client’s DNS address and the router’s upstream DNS addresses are not necessarily the same setting.
Which setup fits your network?
| Situation | Suitable arrangement | Why it fits |
|---|---|---|
| Small home network without special internal DNS requirements | Use the router’s resolver if supported, and have DHCP advertise the router’s LAN address. | The gateway can answer clients and forward queries upstream; support varies by router and firmware. |
| Local names for devices | Use a router resolver with supported local records, or a separate internal DNS service. | Clients must query the resolver that holds the relevant names. RouterOS documents static entries and DHCP-related local names. |
| Centralized DNS filtering or rules | Direct clients to the resolver that owns the intended policy. | Router-hosted entries or adlists do not affect clients that query a different DNS server. |
| Active Directory or another managed domain | Use internal DNS that hosts the domain’s zone, and configure external forwarding as needed. | Microsoft recommends internal, domain-authoritative DNS for Active Directory domain controllers and member servers; domain DNS can forward external requests upstream. See Microsoft’s DNS guidance for Active Directory. |
| Different DNS policies on VPN and non-VPN connections | Check the router’s VPN, WAN, and manual DNS settings and their scope. | These sources can differ, so devices using a VPN may follow a different DNS path. GL.iNet’s version 4.11 documentation describes these distinctions: DNS settings in Router Docs 4. |
There is no universal performance winner established by these configuration references. The practical choice depends on whether you need internal records or centralized policy, whether the resolver is reachable when clients need it, and which functions your router firmware supports.
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How to configure and verify the DNS address
If the router will provide DNS
- Check the router’s documentation or settings for a LAN DNS resolver or DNS-forwarding feature.
- Configure DHCP to advertise the router’s LAN address as the DNS server for clients.
- Set or verify the router’s upstream DNS servers. Depending on the router, these may be obtained automatically from the WAN connection or entered manually.
- On a client, check its network details to confirm which DNS server address it received. Query that address directly if you need to verify which resolver responds. For example, MikroTik documents the form
nslookup name server-address; exact commands and interface labels vary by operating system and router.
If a separate server will provide DNS
- Give the DNS server a stable address that clients can reach on their network.
- Configure the DHCP server to advertise that DNS server’s address to clients. The DHCP server and DNS server may be different devices.
- Check a client’s received DNS address, then send a query directly to the internal DNS server to confirm it responds.
- For names outside the internal zone, configure upstream forwarding or another supported resolution path on the DNS server.
When testing a local hostname, query the server that holds its record. A public resolver or a different internal DNS service will not necessarily know a name configured only on the router or another server. After changing records or resolver settings, cached answers may remain available until their DNS TTL expires; clear relevant caches or test again after that interval.
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Security and common failure points
- Do not expose a router resolver to the public internet. If it answers DNS requests for the LAN, firewall it so unsolicited requests from the WAN cannot reach it. MikroTik warns against creating an open resolver and documents blocking WAN queries on UDP and TCP port 53 in its DNS manual. Use equivalent controls for your router and firewall.
- Make sure the advertised server is reachable. Clients pointed at a separate DNS server cannot resolve names through it if routing, firewall rules, or server availability prevent access.
- Give internal DNS a path to external names. An internal server that hosts a local zone also needs an appropriate external resolution setup, such as forwarding or root hints, for names outside that zone.
- Check which DNS settings are active. WAN-provided, VPN-provided, and manually configured settings can produce different paths; inspect the router’s documentation for its firmware version and policy scope.
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