nixcfg/machines/manager/network.nix

{
  networking.interfaces."enp11s0f0" = {
    ipv4.addresses = [{
      address = "10.32.47.10";
      prefixLength = 24;
    }];
  };

  networking.defaultGateway = {
    address = "10.32.47.1";
    interface = "enp11s0f0";
  };
}