[EMAIL PROTECTED] ("ipver four") writes:

>Is there a reason for including the timestamp option on most of the TCP 
>packets?


The TCP timestamp option is used to obtain better round-trip time
estimates than can be obtained without, and these estimates turn out
to be important in networks with large bandwidth*delay products.

Timestamps in the timestamp option also cycle much more slowly than
sequence numbers on an active high-speed connection and can thus be used
to detect and discard old duplicate packets with apparently valid sequence
numbers.

RFC 1323 explains the details.
-- 
G. Paul Ziemba  [EMAIL PROTECTED]
FreeBSD unix:
11:06AM  up 16 days, 14 mins, 7 users, load averages: 0.03, 0.03, 0.00

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