Analysis of TCP Termination process

From the WS capture link below, can anyone tell me why I am getting server retransmission packets from this simple connect/disconnect TCP sequence from my email server? Am I missing an ACK somewhere? I've tried several different extra ACKs, but nothing has worked. Extra ACKs seems to produce 'Duplicate ACK' packets. This is from my own TCP/IP stack.

Thanks.

Sutton

https://www.cloudshark.org/captures/1e8542d7b55c

disconnect connect tcp

asked 07 Mar '17, 06:32

dodge55
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accept rate: 0%

edited 07 Mar '17, 06:50

grahamb ♦
19.8k●3●30●206

One Answer:

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1	I figured it out. I wasn't adding 1 to the sequence number for the server's FIN packet. So, the seq. number was wrong. permanent link answered 07 Mar '17, 06:48 dodge55 21●4●4●9 accept rate: 0%

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Question tags:

tcp ×752
disconnect ×15
connect ×4

question asked: 07 Mar '17, 06:32

question was seen: 1,347 times

last updated: 07 Mar '17, 06:50

Analysis of TCP Termination process

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You have a trillion packets.

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