Re: Cache traffic - odd?

From: Bill Wichers <>
Date: Thu, 4 Sep 1997 11:48:58 -0400 (EDT)

MRTG can not give an accurate representation of in/out traffic on an
Ethernet interface. I run it on several machines so that I can get a rough
idea of the *total* traffic through them (so that I can compare it to the
router and get an idea as to how many users are really using the cache),
but I can't get a good idea as to the ratio of in to out traffic. This has
to do with the way Ethernet handles packets (or so I'm told), and I don't
know of any way around it.


On Thu, 4 Sep 1997, Leigh Porter wrote:

> Hi folks,
> We run two pretty well used cache servers and I have noticed
> some odd traffic stats.
> The idea of a cahce server is to serve objects locally, an offset of
> this is that it saves bandwidth.
> We use MRTG to monitor the ethernet line going to the cache server
> from a Cisco switch and even though the server gets almost a 30%
> HIT rate there is often more traffic going OUT TO THE SERVER than
> there is come FROM THE SERVER - which is odd!
> Occasionally it will go the other way around.
> Anybody know why this is or have similar monitors of bandwidth
> usage they can share!?
> Thanks,
> Best Regards,
> Leigh Porter
Received on Thu Sep 04 1997 - 08:52:18 MDT

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