[95460] in North American Network Operators' Group
Re: TCP and WAN issue
daemon@ATHENA.MIT.EDU (Roland Dobbins)
Tue Mar 27 16:39:41 2007
In-Reply-To: <379373.72674.qm@web30813.mail.mud.yahoo.com>
From: Roland Dobbins <rdobbins@cisco.com>
Date: Tue, 27 Mar 2007 13:37:03 -0700
To: nanog <nanog@merit.edu>
Errors-To: owner-nanog@merit.edu
On Mar 27, 2007, at 1:26 PM, Philip Lavine wrote:
> inherent in Windows (registry tweaks seem to not functions too well)?
You should certainly look at your MTU and MSS values to ensure there
are no difficulties of that sort. Is there any other factor such as
perhaps slow DNS server (or other lookup-type services) responses
which can be contributing to the perceived slowness? How about
tuning the I/O buffers on the relevant routers? Can you tune the I/O
buffers on the servers?
And what about your link utilization? Is the DS3 sufficient? Take a
look at pps and bps, and take a look at your average packet sizes
(NetFlow can help with this). Are your apps sending lots of smaller
packets, or are you getting nice, large packet-sizes?
Finally, if none of the above help, you could look at something like
SCTP, if your servers and apps support it. But I'd go through the
above exercise, first.
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Roland Dobbins <rdobbins@cisco.com> // 408.527.6376 voice
Words that come from a machine have no soul.
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