diff -r e86da132e7e9 -r cfb7c304cf2d src/internet/model/icmpv6-l4-protocol.cc
--- a/src/internet/model/icmpv6-l4-protocol.cc	Sat May 25 18:18:00 2013 +0200
+++ b/src/internet/model/icmpv6-l4-protocol.cc	Sat May 25 21:36:10 2013 +0200
@@ -292,9 +292,15 @@
   bool next = true;
   bool hasLla = false;
   bool hasMtu = false;
+  Ipv6Address defaultRouter = Ipv6Address::GetZero ();
 
   p->RemoveHeader (raHeader);
 
+  if (raHeader.GetLifeTime())
+    {
+      defaultRouter = src;
+    }
+
   while (next == true)
     {
       uint8_t type = 0;
@@ -305,7 +311,7 @@
         case Icmpv6Header::ICMPV6_OPT_PREFIX:
           p->RemoveHeader (prefixHdr);
           ipv6->AddAutoconfiguredAddress (ipv6->GetInterfaceForDevice (interface->GetDevice ()), prefixHdr.GetPrefix (), prefixHdr.GetPrefixLength (),
-                                          prefixHdr.GetFlags (), prefixHdr.GetValidTime (), prefixHdr.GetPreferredTime (), src);
+                                          prefixHdr.GetFlags (), prefixHdr.GetValidTime (), prefixHdr.GetPreferredTime (), defaultRouter);
           break;
         case Icmpv6Header::ICMPV6_OPT_MTU:
           /* take in account the first MTU option */