transferred (i.e. the number of data bytes in the TCP packet, not the
whole IP packet).  The ack
number is the next seq expected.  Best way is to sniff a TCP session. 
For instance, if a password is entered, say to access a router, the
password is transferred character by character and you will see the seq
numbers increment by one.  You need to pay attention to the direction of
the flow.

If you need an example, post me directly and I'll look through my
sniffer traace library.

Cheers, Fred.

Juan Blanco wrote:
> 
> Team,
> 
> Do any one knows where I could find any document that explain how calculate
> the TCP Ack and Seq numbers. Any explanation will be appreciate.
> 
> Thanks,
> 
> JB




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