tcpdump -n -vvv -s0 ip6 -i eth1 tcpdump: listening on eth1 14:15:14.280790 fe80::20d:88ff:fe91:ff83 > ff02::1: icmp6: router advertisement(chlim=64, pref=medium, router_ltime=100, reachable_time=0, retrans_time=0)(prefix info: LA valid_ltime=300,preferred_ltime=120,prefix=3ffe:302:11:2::/64)(src lladdr: 00:0d:88:91:ff:83) (len 56, hlim 255)
Please check whether your issue corresponds to issue A) at:
http://marc.theaimsgroup.com/?l=linux-netdev&m=113412153702511&w=2
There's also an explanation in the next message in the thread.
-- Pekka Savola "You each name yourselves king, yet the Netcore Oy kingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings