The Access Grid (AG) for collaborative environment exploits IP
multicast, which is quite a promising technology for sharing
network bandwidth. IP multicast however, faces lots of challenges
such as unreliable data transport and immature network
infrastructure. As a step to improve reliability and stability in
IP multicast, it is essential to properly monitor and debug
multicast networks. In this paper we introduce MEET (Multicast
debugging toolkit with End-to-End packet Trace), an user-oriented
multicast debugging toolkit for AG. MEET provides proactive ways
of debugging multicast reachablility and measuring end-to-end
delivery statistics. We are sure that MEET supports multicast
users with a simple yet extensive view of end-to-end multicast
reachability and delivery statistics.