nixfiles/hosts/vault/networking.nix

{...}: {
  systemd.services.systemd-networkd-wait-online.enable = false;

  networking.firewall.enable = true;
  networking.firewall.allowPing = true;
  networking.firewall.allowedTCPPorts = [22];

  networking.enableIPv6 = true;
  networking.usePredictableInterfaceNames = false;
  networking.dhcpcd.enable = true;
  systemd.network = {
    enable = true;
    networks.eth0 = {
      name = "eth0";
      address = ["2a01:4f9:c010:6a89::1/64"];
      gateway = ["fe80::1"];
    };
  };
}