[Bro] giving IPv6 capture filter support

[Bindiya V S]

Hello all,
I want BRO to detect IPv6 packets. I tried giving capture 
filter as 
redef capture_filters = { ["tcp"]= "tcp", ["udp"] = "udp", 
["icmp"] = "icmp", ["ipv6"] = "ether proto 0x86dd"};

BRO is not complaining, but the packets are not even 
recognised at Sesssions.cc NextPacket.

Thank you
Bindiya