Determining network path transmission unit

Details Determining network path transmission unit Determining network path transmission unit

2002-10-10

2008-12-30

Ngo, Ricky (Department: 2616)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S474000

Reexamination Certificate

active

07471681

ABSTRACT:
In one embodiment, a protocol option is implemented in which a network packet stores a maximum transmission unit size to use for sending data on a path between a sender and a recipient. The stored value is replaced if a receiver of the network packet uses a maximum transmission unit (MTU) smaller than the stored value. The option may be used in an initiation packet sent during a communication initiation handshake to allow both establishment of a communication session as well as determination of an efficient transmission unit size. The initiation packet may be sent with a do-not-fragment option set so that if a receiver does not understand the option, and the packet is too large for the receiver, then receiver will reject the packet and place the sender on notice that a conventional trial-and-error approach is required to determine an allowable MTU.

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Mogul, J., et al., “Path MTU Discovery,” Network Working Group, http://www.ietf.org/rfc/rfc1191.txt, Nov. 1990, 19 pgs.

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