Template:FAQ:Applications 08

If a general snmpwalk shows a particular entry, but asking for it more specifically gives a "sub-identifier not found:" or "Unknown Object Identifier" error, then that's a problem with the tool, rather than the agent.

Firstly, make sure that you're asking for the object by the right name. Object descriptors are case-sensitive, so asking for 'sysuptime' will not be recognised, but 'sysUpTime' will.

Alternatively, the object may be defined in a MIB that hasn't been loaded. Try loading in all the MIB files:

       snmpget -m ALL -v1 -c public localhost sysUpTime.0

or specify the name of the appropriate MIB explicitly:

       snmpget -v1 -c public myhost RFC1213-MIB::sysUpTime.0

to denote a particular object in a specific MIB module. Note that this uses the name of the module, not the name of the file. See the second question in this section for the distinction. However, if 'snmpwalk' displays the object by name, this is unlikely to be the cause, and you should look closely at the exact object name you are using.