Wireshark-users: [Wireshark-users] Question about ACK number

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From: Amit Aggarwal <amit.agg@xxxxxxxxxxx>
Date: Mon, 15 Apr 2013 16:10:46 +0900

Hello,

 

Please help to comment about ACK calculation in below scenario.

 

Frame100: Client ACKs the data received till now..  ACK= 10000

 

Frame 101:  Server sends client TCP Data ( 924 bytes) with FIN,PSH and ACK flags set.

 

Frame 102: Client sends ACK= 10925    à QUESTION ..Why is client sending 10925 and not 10924 .. Is it adding 1 for FIN received in Frame 101 ..?  Is it normal ?

 

Frame 103:  Client sends FIN,ACK == ACK = 10925

 

Best Regards

Amit