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beatzaplentyandClaude Sonnet 4.6
e9b225d2d6
Check NixOS configurations / eval-hosts (pull_request) Successful in 10m31s
extraCommands runs after nixos-nat-post is deleted but before it is re-created, so -A nixos-nat-post silently fails every time. POSTROUTING is a built-in chain that always exists; target it directly instead. The -C idempotency check prevents duplicate rules on firewall reloads. Drop networking.nat.enable -- it was only needed for the sub-chain that turned out to be the wrong target. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
43 lines
1.9 KiB
Nix
43 lines
1.9 KiB
Nix
{ vars, ... }:
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{
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imports = [
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../tailscale/subnet-router.nix
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];
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# "server", not "both": this build type advertises LAN subnet routes but
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# doesn't use another tailscale exit node itself, so it doesn't need the
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# "client"-side loose reverse-path filtering that "both" would also enable.
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# Deliberately kept explicit here (not just relying on subnet-router.nix's
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# own setting) so the intent is clear at the build-type level.
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services.tailscale.useRoutingFeatures = "server";
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# Advertise the LAN subnet so Tailscale peers can route back to LAN machines.
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# Must also be approved in the Tailscale admin console (Machines → Edit route settings).
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services.tailscale.extraUpFlags = [ "--advertise-routes=${vars.lanCidr}" ];
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networking.firewall = {
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# Forwarded subnet-router traffic arrives on tailscale0 already
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# tailscale-authenticated -- the firewall's normal per-port allow-list
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# would otherwise drop it. Standard NixOS/Tailscale subnet-router guidance.
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trustedInterfaces = [ "tailscale0" ];
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# SNAT LAN traffic going into Tailscale so the remote peer sees it as
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# coming from this router's Tailscale IP rather than a raw LAN IP.
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# Without this, Tailscale drops forwarded packets whose source is not a
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# recognised Tailscale address.
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#
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# We target POSTROUTING directly (always-existing built-in chain) rather
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# than nixos-nat-post: extraCommands runs after the old nixos-nat-post is
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# deleted but before the new one is created, so -A nixos-nat-post silently
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# fails. The -C check makes the rule idempotent across firewall reloads.
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extraCommands = ''
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iptables -t nat -C POSTROUTING -s ${vars.lanCidr} -o tailscale0 -j MASQUERADE 2>/dev/null || \
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iptables -t nat -A POSTROUTING -s ${vars.lanCidr} -o tailscale0 -j MASQUERADE
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'';
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extraStopCommands = ''
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iptables -t nat -D POSTROUTING -s ${vars.lanCidr} -o tailscale0 -j MASQUERADE 2>/dev/null || true
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'';
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};
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}
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