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Method of determining path maximum transmission unit

  • US 7,542,471 B2
  • Filed: 10/29/2003
  • Issued: 06/02/2009
  • Est. Priority Date: 10/30/2002
  • Status: Active Grant
First Claim
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1. A method for performing by proxies discovery of a maximum transmission unit of a path between a client and a sewer in a more efficient manner, the method comprising the steps of:

  • (a) determining, by a first proxy, a size for a path maximum transmission unit (PMTU) for transmitting network packets between a client and a server by increasing a value of the PMTU by a predetermined percentage for each round-trip-time that elapses without receipt of an indication that fragmentation has occurred;

    (b) repacketizing, by the first proxy, packets received from the client for transmission to the sewer into packet sizes in accordance with the size of the PMTU;

    (c) transmitting, by the first proxy, the repacketized packets to the server;

    (d) detecting, by a second proxy, a packet received from transmission of repacketized packets from the first proxy is fragmented; and

    (e) transmitting, by the second proxy to the first proxy in response to the detection, an acknowledgement packet marked with an indicator that fragmentation has occurred.

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