[mrtg] Re: Inaccurate Results

[Don R Maxwell]

Consider too, that the device you monitor must see the traffic.  If you ftp
to something in the same subnet, a router likely will not record the
traffic.  It will only "see" traffic that passes through it to some other
destination and it will see broadcast traffic.

It likely will not  "see" traffic from a client to a local ftp server.

If you monitor a hub or switch, you will then see the traffic show up on a
graph.

----- Original Message -----
From: "Arif Patel" <arif_patel at norampac.com>
To: <Jeroen.Geusebroek at intercept.cx>; <mrtg at list.ee.ethz.ch>;
<pwilliamson at MANDTBANK.COM>
Sent: Thursday, July 06, 2000 10:30 AM
Subject: [mrtg] Re: Inaccurate Results


>
> MRTG just takes snapshots of whatever it is monitoring ... and graphs the
data showing what happened at that exact point in time .. so in order to get
accurate readings you would have to maintain the same ftp download speed
during every time MRTG "looked" at your device .. you could shorten the time
period ― default is 5 min. ― For something more accurate try looking at
RRDTools ..
>
> Hope that helps.
>
> >>> "Jeroen Geusebroek" <Jeroen.Geusebroek at intercept.cx> 07/06/00 11:24AM
>>>
>
>
> >Sorry, I thought you were monitoring a router or switch of some kind.  Is
> it possible to monitor the equipment that these cards are connected to?
> >It's possible that there is a bottleneck somewhere other than the cards
you
> are monitoring.  Were you FTP'ing on the same segment?  Have you
> >tried FTP'ing from one of the 10m cards to the other or vice versa?
>
> No, i'm afraid i can't monitor the HUB (10/100 Switch); it's just a cheap
> one :).
> I was ftp'ing on the same subnet. Both the 10m cards are in the same
> computer, so
> that won't work. I did try do ftp from a 100Mbit workstation to the 10
mbit
> computer.
> I got 1000KB/S with my ftp-client, but mrtg didn't show it.
>
> Strange strange strange. May be it has to do with my SNMP deamon?
>
> Jeroen
>
>
> >>> "Jeroen Geusebroek" <Jeroen.Geusebroek at intercept.cx> 07/06/00 10:40AM
> >>>
>
>
> >MRTG is just graphing what it is given.  The device you are polling is
not
> providing accurate information.  What kind of device is MRTG
> >getting the data from?  Have you logged into that device and checked it's
> information?
>
> I'm using multiple devices, one 3Com 100Mbit card, one 3Com 10Mbit card
and
> one Intel 10Mb card. All Ethernet.
> What do you mean by logging on the the device?
>
> Jeroen
>
>
>
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