[mrtg] SNMP WaLK question

Steve Shipway s.shipway at auckland.ac.nz
Thu Apr 29 04:13:59 CEST 2010

If I remember right, the 'first subID too big' error came from an older versionof the BER.pm library.  Try upgrading to MRTG 2.16.2 and you'll get the upgraded BER.pm which should avoid this problem.

However, this wont really help you, since the WaLK option retrieves only the COUNT of the number of sub-tems, not their total.  For example, you could use it to get the number of active TCP connections by walking the appropriate table.

To get what you want, a total of values within an OID tree, you'll need to write a data collection plugin.  If you're familiar with Perl its a fairly simple one, just a ingle bulk retrieve from SNMP and iterate the returned table summing as you go.


From: mrtg-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch [mrtg-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch] On Behalf Of Christian Ludwig [cludwig at net.t-labs.tu-berlin.de]

cannot encode Object ID first subid too big in Object ID at /usr/bin/mrtg line 2049
Use of uninitialized value in split at /usr/bin/mrtg line 2049.

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