.forgejo/ci-files/border.nix

@@ -1,4 +1,18 @@
 { lib, pkgs, ... }:
 {
-  networking.hostName = "border-vm";
+  networking = {
+    hostName = "border-vm";
+    useDHCP = false;
+  };
+
+  systemd.network = {
+    enable = true;
+    networks."10-ens3" = {
+      name = "ens3";
+      networkConfig = {
+        DHCPServer = "yes";
+      };
+      address = [ "192.168.242.1/24" ];
+    };
+  };
 }

.forgejo/ci-files/client.nix

@@ -1,4 +1,7 @@
 { lib, pkgs, ... }:
 {
-  networking.hostName = "client-vm";
+  networking = {
+    hostName = "client-vm";
+    useDHCP = true;
+  };
 }

.forgejo/ci-files/default.nix

@@ -3,12 +3,20 @@
   lib ? pkgs.lib,
 }:
 let
-  base-cmd = vm: ''
+  base-cmd =
+    {
+      apnet-mac,
+      apnet-port,
+      vm,
+    }:
+    ''
       ${pkgs.qemu}/bin/qemu-system-x86_64 -m 4G \
               -kernel ${vm.kernel}/bzImage \
               -initrd ${vm.ramdisk}/initrd \
               -append "init=${vm.toplevel}/init loglevel=4 console=ttyS0" \
-            -display none -serial mon:stdio
+              -display none -serial mon:stdio \
+              -netdev socket,mcast=230.0.0.1:${toString apnet-port},localaddr=127.0.0.1,id=apnet \
+              -device virtio-net,disable-legacy=on,disable-modern=off,netdev=apnet,mac=${apnet-mac}
     '';
 
   border-vm =
@@ -30,11 +38,28 @@ let
     }).config.system.build;
 
   border-launch = pkgs.writeShellScript "lauch-border" ''
-    ${base-cmd border-vm}
+    ${base-cmd {
+      vm = border-vm;
+      apnet-port = 1234;
+      apnet-mac = "ba:ad:3d:ea:21:02";
+    }}
   '';
 
   client-launch = pkgs.writeShellScript "lauch-client" ''
-    ${base-cmd client-vm}
+    ${base-cmd {
+      vm = client-vm;
+      apnet-port = 1235;
+      apnet-mac = "ba:ad:3d:ea:21:01";
+    }}
   '';
 in
-{ }
+pkgs.linkFarm "vms" [
+  {
+    name = "border";
+    path = border-launch;
+  }
+  {
+    name = "client";
+    path = client-launch;
+  }
+]

.forgejo/ci-files/vm-base.nix

@@ -2,6 +2,7 @@
   config,
   lib,
   pkgs,
+  modulesPath,
   ...
 }:
 let
@@ -13,6 +14,13 @@ let
   };
 in
 {
+  imports = [ (modulesPath + "/profiles/qemu-guest.nix") ];
+  environment.systemPackages = with pkgs; [ tcpdump ];
+  networking = {
+    useNetworkd = true;
+    firewall.enable = false;
+  };
+
   system.build.ramdisk = pkgs.makeInitrdNG {
     inherit (config.boot.initrd) compressor;
     prepend = [ "${config.system.build.initialRamdisk}/initrd" ];