NixOS-Config/modules/nixos/contabo/wan/default.nix

{
  lib,
  config,
  ...
}:
with lib; let
  cfg = config.modules.contabo.wan;
in {
  options.modules.contabo.wan = {
    enable = mkEnableOption "Enable Contabo Cloud WAN interface configuration";

    macAddress = mkOption {
      type = types.str;
      description = "MAC Address of the WAN interface";
    };

    ipAddresses = mkOption {
      type = types.listOf types.str;
      description = "List of IP Addresses on the WAN interface";
    };
  };

  config = mkIf cfg.enable {
    systemd.network.networks."20-wan" = {
      matchConfig = {
        MACAddress = cfg.macAddress;
      };
      address = cfg.ipAddresses;
      routes = [
        {routeConfig.Gateway = "fe80::1";}
        {routeConfig = {Destination = "62.171.160.1";};}
        {
          routeConfig = {
            Gateway = "62.171.160.1";
            GatewayOnLink = true;
          };
        }
        {
          routeConfig = {
            Destination = "172.16.0.0/12";
            Type = "unreachable";
          };
        }
        {
          routeConfig = {
            Destination = "192.168.0.0/16";
            Type = "unreachable";
          };
        }
        {
          routeConfig = {
            Destination = "10.0.0.0/8";
            Type = "unreachable";
          };
        }
        {
          routeConfig = {
            Destination = "fc00::/7";
            Type = "unreachable";
          };
        }
      ];
    };
  };
}