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In Wireshark, how do I find out the sequence number of the TCP SYN segment that...

In Wireshark, how do I find out the sequence number of the TCP SYN segment that is used to initiate the TCP connection between the client and the server? Which flag identifies this segment as a SYN segment?

What is the sequence number and acknowledgement number of the SYNACK segment sent by server to client in reply to SYN segment? Which flags identify this segment as SYNACK segment?


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Answer #1

In Wireshark, how do I find out the sequence number of the TCP SYN segment that is used to initiate the TCP connection between the client and the server? Which flag identifies this segment as a SYN segment?
Answer:-----------
The sequence number of the TCP SYN segment is 0 since it is used to imitate the TCP connection
between the client computer .
the Syn flag is set to 1 which indicates that this segment is a SYN segment.

What is the sequence number and acknowledgement number of the SYNACK segment sent by server to client in reply to SYN segment? Which flags identify this segment as SYNACK segment?
Answer:-----------
the sequence number of the SYNACK segment sent to the client computer in reply to the SYN is 0.
The value of the acknowledgement field in the SYNACK segment is 1. The value of the ACKnowledgement field in the SYNACK segment is determined by the server .
The server adds 1 to the initial sequence number of SYN segment form the client computer.
For this case, the initial sequence number of SYN segment from the client computer is 0, thus the
value of the ACKnowledgement field in the SYNACK segment is 1.
A segment will be identified as a SYNACK segment if both SYN flag and Acknowledgement in the segment are set to 1.

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