| US 7,483,376 B2 | ||
| Method and apparatus for discovering path maximum transmission unit (PMTU) | ||
| Dwip N. Banerjee, Austin, Tex. (US); Deanna Lynn Quigg Brown, Pflugerville, Tex. (US); Ketan P. Pancholi, Austin, Tex. (US); and Venkat Venkatsubra, Austin, Tex. (US) | ||
| Assigned to International Business Machines Corporation, Armonk, N.Y. (US) | ||
| Filed on Jun. 17, 2004, as Appl. No. 10/870,541. | ||
| Prior Publication US 2005/0281288 A1, Dec. 22, 2005 | ||
| Int. Cl. G08C 15/00 (2006.01); H04L 12/56 (2006.01); H04J 3/22 (2006.01) | ||
| U.S. Cl. 370—235 [370/389; 370/466] | 9 Claims |
| 1. A method, comprising:
receiving a first IP data packet encapsulating a second data packet from a first remote device for transmission to a second
remote device, wherein the encapsulated second data packet comprises at least a header portion containing header information
and a data portion containing data, and wherein the received first IP data packet includes a “don't fragment” flag;
determining if a size of the received first IP data packet is greater than a maximum transmission unit (MTU) value; and
in response to determining that the size of the received first IP data packet is greater than the MTU value, transmitting
a portion of the data within the data portion of the received encapsulated second data packet to the second remote device
and transmitting a message to the first remote device indicating that the size of the received first IP data packet exceeds
the MTU value, wherein transmitting a portion of the data within the data portion of the received encapsulated second data
packet and transmitting the message to the first remote device are done in response to determining that the “don't fragment”
flag is set.
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