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Merge pull request #275902 from williamvds/dnsmasq_docs
nixos/dnsmasq: Add documentation
authored by Guillaume Girol and committed by GitHub 73f0f9c2 7941d7f6
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nixos/modules/services/networking/dnsmasq.md
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nixos/modules/services/networking/dnsmasq.md
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# Dnsmasq {#module-services-networking-dnsmasq}
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Dnsmasq is an integrated DNS, DHCP and TFTP server for small networks.
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## Configuration {#module-services-networking-dnsmasq-configuration}
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### An authoritative DHCP and DNS server on a home network {#module-services-networking-dnsmasq-configuration-home}
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On a home network, you can use Dnsmasq as a DHCP and DNS server. New devices on
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your network will be configured by Dnsmasq, and instructed to use it as the DNS
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server by default. This allows you to rely on your own server to perform DNS
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queries and caching, with DNSSEC enabled.
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The following example assumes that
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- you have disabled your router's integrated DHCP server, if it has one
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- your router's address is set in [](#opt-networking.defaultGateway.address)
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- your system's Ethernet interface is `eth0`
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- you have configured the address(es) to forward DNS queries in [](#opt-networking.nameservers)
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```nix
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{
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services.dnsmasq = {
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enable = true;
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settings = {
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interface = "eth0";
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bind-interfaces = true; # Only bind to the specified interface
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dhcp-authoritative = true; # Should be set when dnsmasq is definitely the only DHCP server on a network
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server = config.networking.nameservers; # Upstream dns servers to which requests should be forwarded
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dhcp-host = [
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# Give the current system a fixed address of 192.168.0.254
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"dc:a6:32:0b:ea:b9,192.168.0.254,${config.networking.hostName},infinite"
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];
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dhcp-option = [
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# Address of the gateway, i.e. your router
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"option:router,${config.networking.defaultGateway.address}"
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];
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dhcp-range = [
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# Range of IPv4 addresses to give out
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# <range start>,<range end>,<lease time>
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"192.168.0.10,192.168.0.253,24h"
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# Enable stateless IPv6 allocation
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"::f,::ff,constructor:eth0,ra-stateless"
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];
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dhcp-rapid-commit = true; # Faster DHCP negotiation for IPv6
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local-service = true; # Accept DNS queries only from hosts whose address is on a local subnet
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log-queries = true; # Log results of all DNS queries
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bogus-priv = true; # Don't forward requests for the local address ranges (192.168.x.x etc) to upstream nameservers
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domain-needed = true; # Don't forward requests without dots or domain parts to upstream nameservers
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dnssec = true; # Enable DNSSEC
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# DNSSEC trust anchor. Source: https://data.iana.org/root-anchors/root-anchors.xml
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trust-anchor = ".,20326,8,2,E06D44B80B8F1D39A95C0B0D7C65D08458E880409BBC683457104237C7F8EC8D";
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};
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};
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}
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```
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## References {#module-services-networking-dnsmasq-references}
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- Upstream website: <https://dnsmasq.org>
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- Manpage: <https://dnsmasq.org/docs/dnsmasq-man.html>
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- FAQ: <https://dnsmasq.org/docs/FAQ>