A method and system for determining path maximum transfer unit (PMTU) in an Internet Protocol (IP) multicast is described. If a packet of a size greater than the MTU of any link of a path, with its Don't Fragment (DF) bit set, is sent by the source, the packet is dropped and an ICMP message, stating...http://www.google.de/patents/US7697524?utm_source=gb-gplus-sharePatent US7697524 - Method and system for determining path maximum transfer unit for IP multicast
