{ lib, ... }: {
  systemd.network.enable = true;
  networking.useDHCP = lib.mkDefault false;

  systemd.network.networks."10-wan" = {
    matchConfig.Name = "wan";
    linkConfig.RequiredForOnline = true;
    DHCP = "yes";
  };

  systemd.network.links."10-wan" = {
    matchConfig.MACAddress = "00:02:c9:9d:ed:64"; # SFP+ port 2.
    linkConfig.Name = "wan";
  };
}