[mrtg] Re: SNMP get problem.

Koelstra, J. (Jan) JKoelstra at MINSZW.NL
Tue Aug 30 15:48:33 MEST 2005

Jan Hugo,

Sorry,  missed the first message.

About your configfile:
In the options line you use 'Gauge' and "Absolute'. A counter can never belong to two different types at the same moment.

An other point in your configfile:
I doubt the oid you are monitoring is a 64bit counter. Temperature is usually given in 32bit counters.

About the error:

If you run MRTG in debug mode it will also give informational messages. Basic logging is usually sufficient to tell you what is wrong.
The first error you get is the following:
SNMP Error:
no response received
SNMPv2c_Session (remote host: "" [].161)
                   community: "READSTRING"
                  request ID: 255616923
                 PDU bufsize: 8000 bytes
                     timeout: 2s
                     retries: 5
                     backoff: 1)

This tells you the SNMP communication from your MRTG host to the target and back is somehow broken.
There can be several reasons for this. To name a few common ones:
SNMP is not running on the target host.
Community string in your MRTG config file doesn't match the one on the target host.
SNMP traffic between the MRTG host and the target is blocked in your network.

Before digging into MRTG the SNMP communication has to be running. To solve problems with SNMP you can use a mibbrowser. Since you are using Windows I recommend Getif (http://www.wtcs.org/snmp4tpc/getif.htm)



-----Original Message-----
From: Jan Hugo Prins [mailto:jhp at jhprins.org]
Sent: Tuesday, August 30, 2005 3:07 PM
To: Koelstra, J. (Jan)
Cc: brunon at abstynenci.org; mrtg at list.ee.ethz.ch
Subject: RE: [mrtg] Re: SNMP get problem.

> Jan Hugo,
> To help we need more specific information.
> (Part of) your MRTG configfile and the complete error message are very
> usefull in solving problems.
> Jan.

Well, if you check the first message you will have both the config file and the debug output from the SNMP communication.

Jan Hugo


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