The TCP Pseudo Header
The TCP pseudo header is used to associate the TCP segment with the IP header. The TCP pseudo header is added to the beginning of the TCP segment only during the checksum calculation and is not sent as part of the TCP segment. The use of the TCP pseudo header assures the receiver that a routing or fragmentation process did not improperly modify key fields in the IP header.
Figure 10-5 illustrates the TCP pseudo header.
Figure 10-5. The structure of the TCP pseudo header
The TCP pseudo header consists of the Source IP Address field, the Destination IP Address field, an Unused field set to 0x00, the Protocol field for TCP (set to ...
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