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Date:      Tue, 4 Apr 2000 09:50:18 -0700
From:      jayanth <jayanth@yahoo-inc.com>
To:        net@FreeBSD.ORG
Subject:   Simultaneous close ....
Message-ID:  <20000404095017.B15820@yahoo-inc.com>

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I was testing b/w two 4.0 boxes and saw the following scenario.

Server side
-----------
10:14:41.260613 server.7000 > client.1136: P 1:101(100) ack 32001 win 65535 (DF)
10:14:41.260709 server.7000 > client.1136: F 101:101(0) ack 32001 win 65535 (DF)
10:14:41.652936 client.1136 > server.7000: F 32001:32001(0) ack 101 win 17520 (D
F)
10:14:41.653075 server.7000 > client.1136: F 101:101(0) ack 32002 win 65535 (DF)
10:14:41.659388 client.1136 > server.7000: F 32001:32001(0) ack 102 win 17520 (D
F)
10:14:41.659485 server.7000 > client.1136: . ack 32002 win 65535 (DF)
10:14:41.989824 client.1136 > server.7000: . ack 102 win 17520 (DF)



Client side
-----------
 18:10:18.484731 server.7000 > client.1136: P 1:101(100) ack 32001 win 65535 (DF
)
18:10:18.485193 client.1136 > server.7000: F 32001:32001(0) ack 101 win 17520 (D
F)
18:10:18.490679 server.7000 > client.1136: F 101:101(0) ack 32001 win 65535 (DF)
18:10:18.490726 client.1136 > server.7000: F 32001:32001(0) ack 102 win 17520 (D
F)
18:10:18.818621 server.7000 > client.1136: F 101:101(0) ack 32002 win 65535 (DF)
18:10:18.818626 server.7000 > client.1136: . ack 32002 win 65535 (DF)
18:10:18.818663 client.1136 > server.7000: . ack 102 win 17520 (DF)

If I remember right the last two ACKS are not necessary during 
simultaneous close? 

jayanth


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