Re: TCP sequence number

[Guy Harris <guy () alum mit edu>]

On Dec 22, 2009, at 6:29 PM, Rayne wrote:

> I would like to know how Wireshark reads the sequence number. I have a packet with the Sequence number displayed as 
> 3273, but the corresponding bytes are "2e b2 cf 43". How did Wireshark get 3273 from 2e b2 cf 43?

By fetching the bytes in question in network byte order, and then subtracting the initial sequence number for the TCP 
connection from it.

(I.e., by default, it displays relative sequence numbers, not absolute sequence numbers.)

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