Patent ID: 6728929
Filing Date: 2004-04-27
Classification: H03M,H04L

Abstract:
A method for calculating a transmission control protocol (TCP) checksum for a data packet having a TCP checksum field to be transmitted over a network, said method comprising the steps of:a) extracting a predetermined portion of the packet, wherein said predetermined portion is less than the portion needed to calculate a TCP checksum for the packet; b) adding the extracted portions and any overflow 16 bits at a time to form a first result; c) inverting the first result to form the TCP checksum; d) inserting the TCP checksum into the TCP checksum field; e) adding the remaining portions of the packet and any overflow 16 bits at a time to form a second result; f) inverting the second result to form a TCP checksum neutralizer; g) inserting said TCP neutralizer into said packet at a predetermined position.