Method and system for determining path maximum transfer unit for IP multicast
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United States of America Patent
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Apr 13, 2010
Grant Date -
Oct 5, 2006
app pub date -
Apr 5, 2005
filing date -
Apr 5, 2005
priority date (Note) -
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Abstract
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 “Destination unreachable, DF bit set”, is sent to the source. The rate of messages to the source is controlled to avoid implosion of traffic. In response to the messages, the source sends multicast probe packets of multiple sizes to multicast distribution tree to determine its PMTU.
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