Date: Wed, 10 Apr 2002 18:10:22 +0000 (UTC) From: "G. Paul Ziemba" <freebsd-net-redist@treehouse.napa.ca.us> To: treehouse-mail-freebsd-net@treehouse.napa.ca.us Subject: Re: TCP Timestamp option? Message-ID: <a91v6e$1f3v$1@hairball.treehouse.napa.ca.us>
next in thread | raw e-mail | index | archive | help
ipver4@hotmail.com ("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 paul@w6yx.stanford.edu
FreeBSD unix:
11:06AM up 16 days, 14 mins, 7 users, load averages: 0.03, 0.03, 0.00
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-net" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?a91v6e$1f3v$1>