nixcfg/systems/x86_64-linux/sgx/network.nix

{ pkgs, lib, config, ... }:
{
  networking.hostName = "sgx"; # Define your hostname.
  networking.useDHCP = false;

  #networking.domain = "fritz.box";
  networking.wireless.enable = false; # Enables wireless support via wpa_supplicant.
  networking.networkmanager.enable = false; # use networkd
  networking.dhcpcd.enable = false; # use networkd
  # services.nscd.enableNsncd = false;

  # systemd-networkd
  systemd.network.enable = true;
  #systemd.network.wait-online.anyInterface = true;
  #systemd.services."systemd-networkd".environment.SYSTEMD_LOG_LEVEL = "debug";

  systemd.network.networks."10-br0" = {
    matchConfig.Name = "br0";
    DHCP = "yes";
    linkConfig.RequiredForOnline = "routable";
    linkConfig.RequiredFamilyForOnline = "both";
  };

  systemd.network.netdevs."br0" = {
    netdevConfig = {
      Name = "br0";
      Kind = "bridge";
      MACAddress = "20:7b:d5:1a:36:3e";
    };
  };

  systemd.network.networks."11-en" = {
    linkConfig.RequiredForOnline = "enslaved";
    matchConfig.Name = "enp0s20f0u2u1";
    networkConfig = {
      Bridge = "br0";
    };
  };

  networking.firewall.allowedTCPPorts = [ 548 ];
  networking.firewall.allowPing = true;
}