anchor.diff:            };
           };
         };
  -      nodes.client = { pkgs, ... }: with pkgs.lib; {
  +      nodes.client = { pkgs, lib, ... }: with lib; {
           virtualisation.vlans = [ 1 ];
           networking = {
             useNetworkd = networkd;
  
positive.code: 
        testScript = ''
          targetIPv4Table = """
          10.0.0.0/16 proto static scope link mtu 1500 
          192.168.1.0/24 proto kernel scope link src 192.168.1.2 
          192.168.2.0/24 via 192.168.1.1 proto static 
          """.strip()
  
          targetIPv6Table = """
  
negative.code:     dhcpSimple = {
        name = "SimpleDHCP";
        nodes.router = router;
        nodes.client = { pkgs, lib, ... }: with lib; {
          virtualisation.vlans = [ 1 2 ];
          networking = {
            useNetworkd = networkd;
  