Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2004-03-30
2008-11-18
Ho, Duc C (Department: 2619)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S392000
Reexamination Certificate
active
07453874
ABSTRACT:
An improved technique for incrementally updating a checksum in a network data packet is disclosed. A partial one's complement sum is first computed by subtracting the checksum value of certain packet header fields from the original data packet checksum. One or more of the packet header fields are then modified. An incrementally updated checksum is then computed by adding a checksum value of the modified packet header fields to the previously calculated partial one's complement sum. The updated checksum then replaces the original data packet checksum in the network data packet.
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Extreme Networks, Inc.
Ho Duc C
Howrey LLP
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