Transport Layer - Freie Universität Berlin
Transport Layer - Freie Universität Berlin
Transport Layer - Freie Universität Berlin
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TCP Pseudo Header<br />
● Checksum: serves among other things for the verification that the packet<br />
was delivered to the correct device.<br />
● The checksum is computed using a pseudo header. The pseudo header is<br />
placed in front of the TCP header, the checksum is computed based on both<br />
headers (the checksum field is here 0).<br />
● The checksum is computed as the 1-complement of the sum of all 16-bit words of the<br />
segment including the pseudo header.<br />
● The receiver also places the pseudo header in front of the received TCP header<br />
and executes the same algorithm (the result must be 0).<br />
00000000<br />
Source address (IP)<br />
Destination address (IP)<br />
Protocol = 6<br />
Length of the TCP segment<br />
Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 8: <strong>Transport</strong> <strong>Layer</strong><br />
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