improvements in networking

- macvtaps working
- only 1 dnsmasq service per namespace
- vms binds to networking services
- lans with domains
- vms no longer assigned same ip (machine id issues)
-

lib/images/commons/scripts-n-files.nix

@@ -11,12 +11,24 @@
   '';
 
   # dhcp for eth0
-  eth0-dhcp-network = pkgs.writeText "eth0-network" ''
+  dhcp-network-for-iface = { iface, routeMetric ? 1024, useDNS ? true }: pkgs.writeText "${iface}-network" ''
     [Match]
-    Name=eth0
+    Name=${iface}
 
     [Network]
     DHCP=yes
+
+    [DHCP]
+    RouteMetric=${toString routeMetric}
+
+    ${if useDNS then ''
+    [DHCPv4]
+    UseDNS=True
+    UseDomains=True
+    '' else ''
+    [DHCPv4]
+    UseDNS=false
+    ''}
   '';
 
   # generate ssh host keys before starting sshd