[mrtg] "WARNING: could not match&get" error message

Carlo Clementi carlo_clementi at it.ibm.com
Wed Aug 14 17:49:31 MEST 2002

MRTG succesfully monitors the traffic of several interfaces of a CISCO
router, BUT fails on a specific port, returning the following error
WARNING: could not match&get for IP

A little investigation (using ucd-snmp commands) brought me to discover
that the router is returning different values for the same OID, when
queried using SNMP GET method as opposed to SNMP GET NEXT method !. The OID
involved is "ipAdEntIfIndex" :

# snmpgetnext public
ip.ipAddrTable.ipAddrEntry.ipAdEntIfIndex. = 13

# snmpget public
ip.ipAddrTable.ipAddrEntry.ipAdEntIfIndex. = 69

This inconsistency is likely to cause MRTG to fail. If this is the case,
this is NOT an MRTG problem.
I have no direct control on the router configuration, so I though I might
seek advice from the list ... any suggestion for further investigation
welcome !

Carlo Clementi

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