diff --git a/p4app/controller.py b/p4app/controller.py
index 733a24e..7984f29 100644
--- a/p4app/controller.py
+++ b/p4app/controller.py
@@ -170,8 +170,8 @@ class L2Controller(object):
         for v6route in self.v6_routes[self.mode]:
             host   = "h{}".format(v6route['port'])
             dev    = "{}-eth0".format(host)
-            net    = ipaddress.ip_network(v6route['net'])
-            ipaddr = net[1]
+            net    = v6route['net']
+            ipaddr = "{}/{}".format(net[1],net.prefix_len)
 
             self.add_host_ips(host, str(net), str(ipaddr), dev)