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feat(network): route tailscale dns through adguard

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- Configure Headscale to use the VPS Tailscale IP (100.64.0.3) as the global DNS server instead of external providers.

- Add firewall rules to allow DNS requests over the `tailscale0` interface.

- Add iptables PREROUTING rules to redirect standard DNS (port 53) from Tailscale clients to AdGuard Home (port 5353) to resolve port conflicts with `aardvark-dns`.
This commit is contained in:
ashisgreat22 2026-03-19 22:14:18 +01:00
parent 4925420fdc
commit 1c76661538
2 changed files with 17 additions and 2 deletions
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16
modules/adguard.nix
View file

@ -159,6 +159,22 @@ in
networking.firewall.allowedTCPPorts = [ 853 ];
networking.firewall.allowedUDPPorts = [ 853 ];
# Allow Tailscale DNS requests
networking.firewall.interfaces."tailscale0" = {
allowedTCPPorts = [ 53 5353 ];
allowedUDPPorts = [ 53 5353 ];
};
# Redirect standard DNS port 53 to AdGuard Home's 5353 for Tailscale clients
networking.firewall.extraCommands = ''
iptables -t nat -A PREROUTING -i tailscale0 -p udp --dport 53 -j REDIRECT --to-ports 5353
iptables -t nat -A PREROUTING -i tailscale0 -p tcp --dport 53 -j REDIRECT --to-ports 5353
'';
networking.firewall.extraStopCommands = ''
iptables -t nat -D PREROUTING -i tailscale0 -p udp --dport 53 -j REDIRECT --to-ports 5353 || true
iptables -t nat -D PREROUTING -i tailscale0 -p tcp --dport 53 -j REDIRECT --to-ports 5353 || true
'';
# Nginx configuration (kept to satisfy ACME challenges for DoT certificates)
services.nginx.virtualHosts."${cfg.domain}" = {
enableACME = true;

3
modules/headscale.nix
View file

@ -105,8 +105,7 @@ in
domains = [ ];
nameservers = {
global = [
"https://dns.mullvad.net/dns-query"
"https://dns.quad9.net/dns-query"
"100.64.0.3"
];
};
override_local_dns = true;