Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2003-10-29
2009-06-02
Shah, Chirag G (Department: 2419)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S395210, C370S401000, C709S203000, C709S221000, C709S238000
Reexamination Certificate
active
07542471
ABSTRACT:
Network endpoints using TCP/IP operate to determine the maximum transmission unit (MTU) of the path between them. This determination is done so as to avoid the expensive IP fragmentation that will occur when transitioning links with a smaller MTU size. The standard method of determining the path MTU (PMTU) has several known deficiencies, including: inefficient use of bandwidth as proper operation will likely result in the loss of one or more packets and difficulty of implementation as the reverse channel communication mechanism, reception of ICMP messages indicating the discarding of unfragmentable packets, is frequently blocked by firewalls and other security apparatus. A method of determining the PMTU between intermediate proxies is disclosed that does not require reception of ICMP messages or the inefficient use of bandwidth due to the presumed dropping of packets with valid data.
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Samuels Allen
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