Experimental Implementation of Mtrace for IPv6

Mtrace
One of major tools for multicast debugging
grasp routing topology
detect a routing loop for RPF
identify points of packet loss on a reverse path

IPv4 mtrace messages
part of IGMP messages: query and response
send a query for given source/group
collecting information along the path (e.g. in/out interfaces)
returned as a response with the information

KAME's implementation: "mtrace6"
based on IPv4 mtrace
as ICMPv6 messages (no IGMP in IPv6)