Wireshark mailing list archives
Re: Question about ACK number
From: Sake Blok <sake () euronet nl>
Date: Mon, 15 Apr 2013 09:25:09 +0200
Hello Amit, Yes, this is normal. Before the data stream and after the data stream, there is 1 phantom byte. So the first data packets has a sequence number that is 1 higher than the initial sequence number and after the FIN, there is also one phantom byte. This makes it possible to make a certain that the FIN was seen and not just the last data byte. See the RFC at http://tools.ietf.org/html/rfc793 Cheers, Sake On 15 apr 2013, at 09:10, Amit Aggarwal wrote:
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 ___________________________________________________________________________ Sent via: Wireshark-users mailing list <wireshark-users () wireshark org> Archives: http://www.wireshark.org/lists/wireshark-users Unsubscribe: https://wireshark.org/mailman/options/wireshark-users mailto:wireshark-users-request () wireshark org?subject=unsubscribe
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Current thread:
- Question about ACK number Amit Aggarwal (Apr 15)
- Re: Question about ACK number Sake Blok (Apr 15)
- Re: Question about ACK number Amit Aggarwal (Apr 15)
- Re: Question about ACK number Sake Blok (Apr 15)