nix-config/hosts/toaster/network.nix

{ pkgs, ... }: {
  users.users.grue.extraGroups = [ "networkmanager" ];

  networking = {
    hostName = "toaster";
    firewall.enable = true;
    wireguard.enable = true;
  };

  services.resolved = {
    enable = true;
    dnssec = "allow-downgrade";
    fallbackDns = [
      "9.9.9.9"
      "2620:fe::fe"
      "149.112.112.112"
      "2620:fe::9"
    ];
  };

  # fixup the rpfilter fucking up the networkmanager wireguard
  networking.firewall = {
    # if packets are still dropped, they will show up in dmesg
    logReversePathDrops = true;
    # wireguard trips rpfilter up
    extraCommands = ''
      ip46tables -t mangle -I nixos-fw-rpfilter -p udp -m udp --sport 51820 -j RETURN
      ip46tables -t mangle -I nixos-fw-rpfilter -p udp -m udp --dport 51820 -j RETURN
      ip46tables -t mangle -I nixos-fw-rpfilter -p udp -m udp --sport 1337 -j RETURN
      ip46tables -t mangle -I nixos-fw-rpfilter -p udp -m udp --dport 1337 -j RETURN
    '';
    extraStopCommands = ''
      ip46tables -t mangle -D nixos-fw-rpfilter -p udp -m udp --sport 51820 -j RETURN || true
      ip46tables -t mangle -D nixos-fw-rpfilter -p udp -m udp --dport 51820 -j RETURN || true
      ip46tables -t mangle -D nixos-fw-rpfilter -p udp -m udp --sport 1337 -j RETURN || true
      ip46tables -t mangle -D nixos-fw-rpfilter -p udp -m udp --dport 1337 -j RETURN || true
    '';
  };
}