TCP sequence number question

Question

This is more of a theoretical question than an actual problem I have.

If I understand correctly, the sequence number in the TCP header of a packet is the index of th

Answer 1

The sequence number loops back to 0. Source:

TCP sequence numbers and receive windows behave very much like a clock. The receive window shifts each time the receiver receives and acknowledges a new segment of data. Once it runs out of sequence numbers, the sequence number loops back to 0.

Also see chapter 4 of RFC 1323.