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.
asked 07 Mar '17, 06:32
edited 07 Mar '17, 06:50
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.
answered 07 Mar '17, 06:48