From: Andy Furniss <lists@andyfurniss.entadsl.com>
To: netdev@vger.kernel.org
Subject: Controlling TCP window size
Date: Tue, 16 May 2006 12:06:57 +0100 [thread overview]
Message-ID: <4469B251.3050901@andyfurniss.entadsl.com> (raw)
I've been doing some testing of my new wan connection and noticed that
when I specify a window with ip route it still changes after a while.
Using 2.6.16.11 and latest iproute2.
ip ro del default
ip ro add default via 192.168.0.1 window 28000
ip ro ls
192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.3
default via 192.168.0.1 dev eth0 window 28000
timestamps and window scaling are off using reno.
Downloading a 5 meg file I advertise the correct window - the whole
multiple of my mss below 28000 = 27322.
After about 1300 lines of the dump the window creeps back up to 32767.
001959 IP 81.31.115.186.80 > 192.168.0.3.42305: . 1051979:1053417(1438)
ack 123 win 57520
000011 IP 192.168.0.3.42305 > 81.31.115.186.80: . ack 1053417 win 27322
002030 IP 81.31.115.186.80 > 192.168.0.3.42305: . 1053417:1054855(1438)
ack 123 win 57520
001962 IP 81.31.115.186.80 > 192.168.0.3.42305: . 1054855:1056293(1438)
ack 123 win 57520
000011 IP 192.168.0.3.42305 > 81.31.115.186.80: . ack 1056293 win 27322
003020 IP 81.31.115.186.80 > 192.168.0.3.42305: . 1056293:1057731(1438)
ack 123 win 57520
001968 IP 81.31.115.186.80 > 192.168.0.3.42305: . 1057731:1059169(1438)
ack 123 win 57520
000012 IP 192.168.0.3.42305 > 81.31.115.186.80: . ack 1059169 win 30198
002024 IP 81.31.115.186.80 > 192.168.0.3.42305: . 1059169:1060607(1438)
ack 123 win 57520
000012 IP 192.168.0.3.42305 > 81.31.115.186.80: . ack 1060607 win 32767
001980 IP 81.31.115.186.80 > 192.168.0.3.42305: . 1060607:1062045(1438)
ack 123 win 57520
000011 IP 192.168.0.3.42305 > 81.31.115.186.80: . ack 1062045 win 32767
Andy.
next reply other threads:[~2006-05-16 11:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-16 11:06 Andy Furniss [this message]
2006-05-16 18:28 ` Controlling TCP window size John Heffner
2006-05-16 18:36 ` Andy Furniss
2006-05-16 18:48 ` John Heffner
2006-05-16 23:01 ` David S. Miller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4469B251.3050901@andyfurniss.entadsl.com \
--to=lists@andyfurniss.entadsl.com \
--cc=netdev@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).