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what will happen if the client receives syn ack retransmission when it is in fin-wait-1

Hi, We are facing a peculiar issue in our network. From the ethreal packet capture on the client side, I see the following behaviour which appears quite strange to me:

1 Client --> Server [SYN] seq=0

2 Server --> Client [SYN, ACK] seq=0 ack=1

3 Client --> Server [ACK] seq=1 ack =1

4 Client --> Server [PSH] seq=1 ack =1 len=488

5 Client --> Server [FIN, ACK] seq =489 ack =1

6 Server --> Client [SYN, ACK] seq=0 ack=1 retransmission

7 Client --> Server [ACK] seq=490 ack=1( I don't know why the seq is 490,because I think it should be seq =1 ack=1)

8 Client --> Server [FIN,PSH,ACK] seq=1 ack=1 len=488

9 Server --> Client [ACK] seq=1 ack=490

Any ideas as to why this could be happening?

what will happen if the client receives syn ack retransmission when it is in fin-wait-1

Hi, We are facing a peculiar issue in our network. From the ethreal packet capture on the client side, I see the following behaviour which appears quite strange to me:

1
#1 Client --> Server [SYN] seq=0
2 seq=0 #2 Server --> Client [SYN, ACK] seq=0 ack=1 3 ack=1 #3 Client --> Server [ACK] seq=1 ack =1

=1   4 #4 Client --> Server  [PSH] seq=1 ack =1 len=488
 5 len=488
#5 Client --> Server  [FIN, ACK] seq =489 ack =1=1   6 #6 Server --> Client  [SYN, ACK] seq=0 ack=1 retransmissionretransmission   7 #7 Client --> Server  [ACK] seq=490 ack=1( I don't know why the seq is 490,because I think it should be seq =1 ack=1)
 8 ack=1)
#8 Client --> Server  [FIN,PSH,ACK] seq=1 ack=1 len=488
 9 len=488
#9 Server --> Client  [ACK] seq=1 ack=490ack=490

Any ideas as to why this could be happening?

Revision history [back]

what will happen if the client receives syn ack retransmission when it is in fin-wait-1

1 Client --> Server [SYN] seq=0

2 Server --> Client [SYN, ACK] seq=0 ack=1

3 Client --> Server [ACK] seq=1 ack =1

4 Client --> Server [PSH] seq=1 ack =1 len=488

5 Client --> Server [FIN, ACK] seq =489 ack =1

6 Server --> Client [SYN, ACK] seq=0 ack=1 retransmission

7 Client --> Server [ACK] seq=490 ack=1( I don't know why the seq is 490,because I think it should be seq =1 ack=1)

8 Client --> Server [FIN,PSH,ACK] seq=1 ack=1 len=488

9 Server --> Client [ACK] seq=1 ack=490

what will happen if the client receives syn ack retransmission when it is in fin-wait-1

1 #1 Client --> Server [SYN] seq=0

2 seq=0 #2 Server --> Client [SYN, ACK] seq=0 ack=1

3 ack=1 #3 Client --> Server [ACK] seq=1 ack =1

4 #4 Client --> Server [PSH] seq=1 ack =1 len=488

5 len=488 #5 Client --> Server [FIN, ACK] seq =489 ack =1

6 #6 Server --> Client [SYN, ACK] seq=0 ack=1 retransmission

7 #7 Client --> Server [ACK] seq=490 ack=1( I don't know why the seq is 490,because I think it should be seq =1 ack=1)

8 ack=1) #8 Client --> Server [FIN,PSH,ACK] seq=1 ack=1 len=488

9 len=488 #9 Server --> Client [ACK] seq=1 ack=490

1
`#1 Client --> Server [SYN] seq=0`