depot/third_party/nixpkgs/nixos/tests/ndppd.nix

import ./make-test-python.nix (
  { pkgs, lib, ... }:
  {
    name = "ndppd";
    meta = with pkgs.lib.maintainers; {
      maintainers = [ fpletz ];
    };

    nodes = {
      upstream =
        { pkgs, ... }:
        {
          environment.systemPackages = [ pkgs.tcpdump ];
          networking.useDHCP = false;
          networking.interfaces = {
            eth1 = {
              ipv6.addresses = [
                {
                  address = "fd23::1";
                  prefixLength = 112;
                }
              ];
              ipv6.routes = [
                {
                  address = "fd42::";
                  prefixLength = 112;
                }
              ];
            };
          };
        };
      server =
        { pkgs, ... }:
        {
          boot.kernel.sysctl = {
            "net.ipv6.conf.all.forwarding" = "1";
            "net.ipv6.conf.default.forwarding" = "1";
          };
          environment.systemPackages = [ pkgs.tcpdump ];
          networking.useDHCP = false;
          networking.interfaces = {
            eth1 = {
              ipv6.addresses = [
                {
                  address = "fd23::2";
                  prefixLength = 112;
                }
              ];
            };
          };
          services.ndppd = {
            enable = true;
            proxies.eth1.rules."fd42::/112" = { };
          };
          containers.client = {
            autoStart = true;
            privateNetwork = true;
            hostAddress = "192.168.255.1";
            localAddress = "192.168.255.2";
            hostAddress6 = "fd42::1";
            localAddress6 = "fd42::2";
            config = { };
          };
        };
    };

    testScript = ''
      start_all()
      server.wait_for_unit("multi-user.target")
      upstream.wait_for_unit("multi-user.target")
      upstream.wait_until_succeeds("ping -c5 fd42::2")
    '';
  }
)