Method and system for incrementally updating a checksum in a network data packet
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United States of America Patent
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Nov 18, 2008
Issued Date -
N/A
app pub date -
Mar 30, 2004
filing date -
Mar 30, 2004
priority date (Note) -
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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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