--- base/univention-base-files/conffiles/etc/network/interfaces.d/10-default	2014-01-20 14:50:24.157553631 +0100
+++ base/univention-base-files/conffiles/etc/network/interfaces.d/10-default	2014-01-24 10:07:23.072685202 +0100
@@ -69,18 +69,19 @@ 
 
 	# Validate addresses
 	interface_addresses = {}
-	for iface, name in interfaces.ipv6_interfaces:
-		addr = iface.ipv6_address(name)
-		if addr is False:
-			print '# ERROR: invalid IPv6 address in interfaces/%s/ipv6/%s/*' % \
-				(iface.name, name)
-			continue
-		addresses = interface_addresses.setdefault(iface.name, set())
-		if addr in addresses:
-			print '# ERROR: duplicate IPv6 address in interfaces/%s/ipv6/%s/*' % \
-				(iface.name, name)
-			continue
-		addresses.add(addr)
+	for _name, iface in interfaces.all_interfaces:
+		for name in iface.ipv6_names:
+			addr = iface.ipv6_address(name)
+			if not addr:
+				print '# ERROR: incomplete/invalid IPv6 address in interfaces/%s/ipv6/%s/*' % \
+					(iface.name, name)
+				continue
+			addresses = interface_addresses.setdefault(iface.name, set())
+			if addr.ip in addresses:
+				print '# ERROR: duplicate IPv6 address in interfaces/%s/ipv6/%s/*' % \
+					(iface.name, name)
+				continue
+			addresses.add(addr.ip)
 
 	# configure interface
 	for iface, names in groupby(interfaces.ipv6_interfaces, itemgetter(0)):
@@ -88,8 +89,6 @@ 
 			addresses = interface_addresses[iface.name]
 		except KeyError:
 			continue  # validation failed
-		if not addresses:
-			continue  # validation failed
 
 		auto(iface.name, iface.start)
 		print 'iface %s inet6 static' % (iface.name,)
@@ -97,7 +96,7 @@ 
 		for i, (iface, name) in enumerate(names):
 			addr = iface.ipv6_address(name)
 			try:
-				addresses.remove(addr)
+				addresses.remove(addr.ip)
 			except KeyError:
 				continue  # invalid or duplicate
 			print '# %s' % (name,)