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Date: Sun, 10 Sep 2000 15:36:06 -0400
From: Laurence Berland <stuyman@confusion.net>
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To: sthaug@nethelp.no
Cc: mike@mikesweb.com, wizard@sybaweb.co.za, freebsd-isp@FreeBSD.ORG
Subject: Re: NIC settings
References: <4.3.2.7.2.20000910152245.00b83240@mail.mikesweb.com> <15676.968614347@verdi.nethelp.no>
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Should not the router on the T1 be performing some sort of cacheing so
that packets don't get retransmitted across the T1 every time a
collision occurs?

sthaug@nethelp.no wrote:
> 
> > My reasoning was because of all the collisions, data packets were being
> > resent at a high rate, filling up my T1s quicker, and causing a lot of
> > interface resets on my router. When I went to a switch, I noticed about a
> > 10% decrease in network traffic..
> 
> Then I think you should look for other causes for this change. A collision
> does *not* result in a whole packet being "wasted" (as many people seem to
> think) - it uses *up to* (512 + 32) bit, ie. 68 byte. You'd need a lot of
> very small packets, and a rather high collision rate, to get a 10% increase
> in traffic due to collisions.
> 
> Steinar Haug, Nethelp consulting, sthaug@nethelp.no
> 
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