Re: Cache traffic - odd?

From: Jaye Mathisen <>
Date: Fri, 5 Sep 1997 00:04:41 -0700 (PDT)

Make sure that you have MRTG configured with or w/o the -1 to swap the
in/out bytes.

If you look at your ethernet interface, it will tell you bps and packets,
and you can figure out if it needs switching.

I have no idea why MRTG couldn't give accurate answers for ethernet
interfaces, it's just parsing SNMP data, which since it comes from the
router itself, I can't imagine it being too wildly inaccurate.

My numbers from my cache on a dedicated 10base-T off my Cisco are dead on.

On Thu, 4 Sep 1997, Bill Wichers wrote:

> 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.
> -Bill
> 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 Fri Sep 05 1997 - 00:06:57 MDT

This archive was generated by hypermail pre-2.1.9 : Tue Dec 09 2003 - 16:36:56 MST