 | 1 | initial version |
I may be missing something here. OP is talking both source ports and sequence numbers. I think we all agree the TCP Port Reuse messages are unneeded / wrong. In first (and most) TCP SYN packets, the TCP Segment Lenth is zero (0). The TCP Segment length determines how the sequence number will increment. As you can see in the flow, the client performs an initial SYN, waits 1 second, then 2 seconds, then 4 seconds - as it attempts to connect to the server. The 4th SYN completes. For each of the initial SYN requests, the Sequence number is and will remain 0 - as there is no TCP Payload. As grahamb implies, I believe the TCP Sequence number will only increment as there is a new TCP payload being sent. If the sender is re-sending a TCP payload, the original SEQ number will be used.
