--- interfaces.py.orig	2011-07-06 16:13:00.000000000 +0200
+++ interfaces.py	2011-07-06 16:22:30.000000000 +0200
@@ -41,6 +41,11 @@
 
 def start_iface(iface):
 	if iface:
+		# configure VLAN
+		vlan = iface.split('.')
+		if len(vlan) == 2 and vlan[0].strip() and vlan[1].strip():
+			os.system('modprobe 8021q')
+			os.system('vconfig add %s %s >/dev/null 2>&1' % (vlan[0].strip(), vlan[1].strip()))
 		os.system('ifup %s' % iface)
 
 def restore_gateway(gateway):