diff --git a/doc/plan.org b/doc/plan.org
index 41ad85f..eb2cbaa 100644
--- a/doc/plan.org
+++ b/doc/plan.org
@@ -723,7 +723,8 @@ p4@ubuntu:~/master-thesis$
 ***** TODO Make switch answer icmp echo request for
 ***** TODO Add default route for v4 hosts
 **** TODO Translate ipv6 --> ipv4 with a (freely programmable) prefix
-***** TODO Insert prefix into switch: v6_networks
+***** DONE Insert prefix into switch: v6_networks
+***** TODO Support multiple ipv6 source networks: need new table w/ 2 keys!
 ***** TODO Implement the calculation
 ***** TODO Sketch the flow for session handling for icmp6 w/o packet loss
       - switch receives icmp6 packet for known prefix
diff --git a/p4app/controller.py b/p4app/controller.py
index cc399a9..ba4b5bb 100644
--- a/p4app/controller.py
+++ b/p4app/controller.py
@@ -81,7 +81,9 @@ class L2Controller(object):
             )
 
         self.v6_routes['router'] = self.v6_routes['base']
-        self.v6_routes['range_router'] = self.v6_routes['base']
+
+        # only 1 route to avoid table duplicate/conflict
+        self.v6_routes['range_router'] = self.v6_routes['base'][0:1]
 
         self.v4_routes = {}
         self.v4_routes[None] = []