[68941] in North American Network Operators' Group
Re: Sprint Help
daemon@ATHENA.MIT.EDU (Leo Bicknell)
Thu Mar 18 14:21:12 2004
Date: Thu, 18 Mar 2004 14:20:43 -0500
From: Leo Bicknell <bicknell@ufp.org>
To: nanog@merit.edu
Mail-Followup-To: nanog@merit.edu
In-Reply-To: <DD7FE473A8C3C245ADA2A2FE1709D90B0DAFE7@server2003.arneill-py.sacramento.ca.us>
Errors-To: owner-nanog-outgoing@merit.edu
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In a message written on Thu, Mar 18, 2004 at 11:08:21AM -0800, Michel Py wr=
ote:
> > Leo Bicknell wrote
> > Your problem is right here:
> > 14 urish-pitts-gw.centrepc.net (67.97.250.166) 100 msec *
> > 100 msec NT in many configs defaults to a TCP Window size
> > of 8k, other NT and Server 2000 default to 16k.
>=20
> This seems premature as a conclusion to me. If they don't have issues
> with Japan where the best RTT they can get is around 130ms I don't see
> why 100ms would be an issue.
Because these are theoretical maximums. Very minor other issues
(eg some packet reordering, 5-10ms of jitter, a single lost packet
every now and then) will easily cut this in half. 130ms link at
95% of max (about the best you do on a clean link) would be 59k/sec,
a 100ms link with 10ms jitter would drop to around 50% of max, or
40k/sec, or 33% slower.
I bet setting the windows to 32k on both sides fixes his problem.
--=20
Leo Bicknell - bicknell@ufp.org - CCIE 3440
PGP keys at http://www.ufp.org/~bicknell/
Read TMBG List - tmbg-list-request@tmbg.org, www.tmbg.org
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