working bridge configuration

devices/desk.nix

@@ -48,7 +48,7 @@
   # (the default) this is the recommended approach. When using systemd-networkd it's
   # still possible to use this option, but it's recommended to use it in conjunction
   # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
-  networking.useDHCP = lib.mkDefault true;
+  # networking.useDHCP = lib.mkDefault true;
   # networking.interfaces.enp4s0.useDHCP = lib.mkDefault true;
 
   nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";

qemu-bridges.nix

@@ -4,9 +4,15 @@
         "enp4s0"
     ];
 
+    boot.kernel.sysctl."net.ipv4.ip_forward" = 1;
+
     networking.interfaces.virtbr0 = {
         useDHCP = true;
     };
 
-    virtualisation.libvirtd.allowedBridges = [ "virtbr0" ];
+    virtualisation.libvirtd = { 
+        enable = true;
+        allowedBridges = [ "virtbr0" ];
+        
+    };
 }