[mrtg] Re: SNMP get problem.

Koelstra, J. (Jan) JKoelstra at MINSZW.NL
Tue Aug 30 16:35:00 MEST 2005

Jan Hugo,

By adding '::::2' to your target you request 64 bit counters...



-----Original Message-----
From: Jan Hugo Prins [mailto:jhp at jhprins.org]
Sent: Tuesday, August 30, 2005 4:20 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,
> 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)
> Hth,
> Jan.

What I also mentioned in my first message is that snmpwalk from the specified system is working perfectly and all the values are properly returned. It only fails when tried from within mrtg.

For you some snmpwalk info:
C:\Program Files\mrtg\bin>snmpwalk -v 2c -c READSTRING SNMPv2-SMI::enterprises.17587. = INTEGER: 44 SNMPv2-SMI::enterprises.17587. = INTEGER: 41

C:\Program Files\mrtg\bin>snmpwalk -v 2c -c READSTRING SNMPv2-SMI::enterprises.17587. = INTEGER: 32 SNMPv2-SMI::enterprises.17587. = INTEGER: 48

As you can see the value that is returned is indeed a normal 32 bit value. Don't know where I mentioned that I needed to get a 64 bit value back.

When I look further down in the debug output I see the following line:
WARNING: no data for at
Skipping further queries for Host in this round.

For me this looks like he is trying to request OID instead of and this OID is not available. When I try to request this OID with snmpwalk I receive the 2 underlying OID's but mrtg doesn't get them. Maybe MRTG tries to request the OID's more specificly? snmpget also returns an error telling me that the OID is not available.

C:\Program Files\mrtg\bin>snmpget -v 2c -c READSTRING Error in packet
Reason: (noSuchName) There is no such variable name in this MIB. Failed object: SNMPv2-SMI::enterprises.17587.

Removed the Absolute parameter, but this does not change my problem.

Jan Hugo Prins


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