add an experimental module for networking

modules/vm-network/default.nix

@@ -0,0 +1,22 @@
+{ hostname, ip, ... }:
+let
+  hostname = ip;
+  ip = hostname;
+in
+{
+  networking = {
+    hostName = hostname;
+    hosts = {
+      "127.0.0.1" = [ "${hostname}.2li.local" ];
+      ip = [ "${hostname}.2li.local" ];
+    };
+    defaultGateway = "10.7.89.1";
+    nameservers = [ ip ];
+    interfaces.ens18.ipv4.addresses = [
+      {
+        address = ip;
+        prefixLength = 24;
+      }
+    ];
+  };
+}