Re: question about TCP flow behavior

[Yao Kuang Lai <yaokuang.lai () ericsson com>]

Sent from my HTC Tilt™ 2, a Windows® phone from AT&T

________________________________
From: Tal Bar-Or <tbaror () gmail com>
Sent: Friday, April 16, 2010 4:31 AM
To: Community support list for Wireshark <wireshark-users () wireshark org>
Subject: Re: [Wireshark-users] question about TCP flow behavior

Hi Boaz,

For My opinion that's mean that's HOST B sends data while HOST A receive it and the ACK is calculated (incremented) 
with the amount of data payload size.
btw i would disable relative seq for TCP  only if iwould do capture from both side to compare seq ACK.

Regards
Tal,

On Fri, Apr 16, 2010 at 12:12 PM, Boaz Galil <boaz20 () gmail com<mailto:boaz20 () gmail com>> wrote:
Dear Experts,

I am trying to review a TCP flow using wire shark (I have removed the “relative seq for TCP”).
My questions are this:
During the TCP flow I see the following:
Server A sends Server B [PSH,ACK] seq=1058555096 ACK=2917173962
Server B sends Server A [ACK] seq=2917173962 ACK=1058555108
Server A sends Server B [PSH,ACK] seq=1058555108, ACK=2917173962
Server B sends Server A [ACK] seq=2917173962 ACK=1058556516
And so on, so Server B always sends ACK on a sequence with higher number…
Does anyone know what the explanation of this behavior is? Is this a normal TCP flow behavior?

Please don’t hesitate to contact me if you have any questions or comments.
Thanks in advance,

Boaz Galil


--
Boaz.

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Tal Bar-or
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