[mrtg] Re: target OID value

Koelstra, J. (Jan) JKoelstra at MINSZW.NL
Wed Nov 30 09:59:57 MET 2005

> it is reference the value that is entered for the 'Target' OID.
> it seems that a number needs to appended to the OID as would be reported by the MIB browser

Since MRTG does an snmpget you have to use an oid that returns a value. Usualy this is the basic oid with an instance number added to it.
These instance numbers can usualy be found little higher in the mib-tree.

> could not find specific reference to this on mrtg site but examples suggest that this should be a .0
> this would not work, with MRTG erroring as it tries to collect the data
> i found other examples which used as .1 and lo and behold this works ok !

Depending on manufacturer instance numbers can be any number, but mostly when a system is brought up the first instance within an oid is 0 or 1. Some manufacturers seem to start at random numbers which can even change after a restart.

> the purpose of this post is to determine what 'science' there is to the value that needs to be appended to be OID.
> my first thought was that might reference the 'instance' of the object (eg CPU number) being queried ??

No Science. The only way to find out wich oids are available on a system is by using a MIB browser.




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