Comment 3 for bug 771209

Apparently this is known in VLAN and bridging;

http://permalink.gmane.org/gmane.linux.network.bridge/5362

The (short term?) fix would be to install ebtables, and the run the command;

  ebtables -t broute -A BROUTING -i eth0 -p 802_1Q -j DROP

This got my interfaces bridging with VLAN again.