[mrtg] Re: Newbie question

[William Owen]

You can use a MaxBytes of 193000 (speed of your link) and an AbsMax of
1250000 or 12500000 which would be the speed of your physical interface.
That way you still get a nice graph for your 1.5 Mbps link but you do not
trash the values if you see 1.51 Mbps of throughput for whatever reason.

-----Original Message-----
From: Erik Amundson [mailto:Erik.Amundson at oati.net] 
Sent: Monday, February 28, 2005 4:53 PM
To: Bill Wichers
Cc: Leone, Michael; mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: Newbie question

I have a question...

Is MaxBytes just used to calculate the percentage values, and possibly
give the graph a fixed scale?  If this is true, then what happens if you
go over the MaxBytes value on the interface?  I realize that a
fixed-scale graph would go off the charts, but would the percentages go
to 150%, for example?  Anybody ever tried this?
 


- Erik Amundson


-----Original Message-----
From: Bill Wichers [mailto:billw at waveform.net] 
Sent: Monday, February 28, 2005 4:48 PM
To: Bill Wichers
Cc: Leone, Michael; 'mrtg at list.ee.ethz.ch'
Subject: [mrtg] Re: Newbie question

>> Since what I mainly want to do is monitor bandwdith of the T-1, I 
>> want to monitor interface 1 and 3. Do I list the MaxBytes for both of

>> these interfaces to be 193000 (T-1 bandwidth in bytes)? And so my 
>> graph would show the bandwidth consumed in bits?

I need to pay more attention when replying to these :-)

You should set the MaxBytes for the Ethernet to an appropriate value for
an Ethernet port (1250000 or 12500000 for 10 Mb/s or 100 Mb/s,
respectively). Remember that it's possible for the Ethernet port to move
lots more than the T1  during certain activities (tftp updates on the
router, DoS attacks, etc.).

Normally MaxBytes is set to whatever is the maximum capacity -- in
bytes/second -- of the interface you are monitoring with the associated
Target[]: line in MRTG.

     -Bill

*****************************
Waveform Technology
UNIX Systems Administrator


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