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tailscale: fix broken DNS on IPv6 only tailnets #1246

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tailscale: fix broken DNS on IPv6 only tailnets #1246

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11 changes: 7 additions & 4 deletions modules/services/tailscale.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -33,15 +33,15 @@ in
1. at least one DNS server is added
2. `Override local DNS` is enabled

As this option sets 100.100.100.100 as your sole DNS server, if the requirements above are not met,
As this option sets 100.100.100.100 and fd7a:115c:a1e0::53 as your sole DNS servers, if the requirements above are not met,
all non-MagicDNS queries WILL fail.
'';
};
};

config = mkIf cfg.enable {
assertions = [{
assertion = !cfg.overrideLocalDns || config.networking.dns == [ "100.100.100.100" ];
assertion = cfg.overrideLocalDns -> (builtins.any (x: x != "100.100.100.100" || x != "fd7a:115c:a1e0::53") config.networking.dns);
message = ''
DNS servers should be configured on the Tailscale control panel when `services.tailscale.overrideLocalDns` is enabled.

Expand All @@ -61,10 +61,13 @@ in
};
};

networking.dns = mkIf cfg.overrideLocalDns [ "100.100.100.100" ];
networking.dns = mkIf cfg.overrideLocalDns [ "100.100.100.100" "fd7a:115c:a1e0::53" ];

# Ensures Tailscale MagicDNS always works even without adding 100.100.100.100 to DNS servers
environment.etc."resolver/ts.net".text = "nameserver 100.100.100.100";
environment.etc."resolver/ts.net".text = ''
nameserver 100.100.100.100
nameserver fd7a:115c:a1e0::53
'';

# This file gets created by tailscaled when `Override local DNS` is turned off
environment.etc."resolver/ts.net".knownSha256Hashes = [
Expand Down