Re: I am struggling to understand the snmptranslate command

On 11/07/06, Jeff Silverman <[email protected]> wrote:

> Is this problem the reason why snmpget doens't work?
>
> [jeffs@black ~]$ snmpget -v 2c -Le -c puBlIc localhost
> .1.3.6.1.2.1.4.31.1.1.17
> IP-MIB::ipSystemStatsInDiscards = No Such Object available on this agent
> at this OID


No.
The 'snmpget' command is interpreting the numeric OID, and translating it
into
the textual equivalent quite happily.  The problem lies elsewhere (see
below).


Here are some other things I have tried which still don't work the way I
> guess I expect them to.
>
> [jeffs@black ~]$ snmpget -v 2c -c public localhost system.sysDescr.0
> SNMPv2-MIB::sysDescr.0 = STRING: Linux black 2.6.15-1.2054_FC5 #1 Tue
> Mar 14 15:48:33 EST 2006 i686
> [jeffs@black ~]$ snmpget -v 2c -c public localhost SNMPv2-MIB::sysDescr
> SNMPv2-MIB::sysDescr = No Such Instance currently exists at this OID


That's because you've omitted the instance identifier(s).
A value is always associated with an *instance* of a MIB object,
not with the (abstract) object itself.   If you're familiar with
object-oriented
programming, think of a MIB object as similar to a class - you need to
declare one or more instances of that class before you can use it.

(And yes, I know that's not strictly true - e.g. "static" fields/methods!)

This is also the source of your earlier problem - you omitted the
instance subidentifier(s) for ipSystemStatsInDiscard


 Try using "snmpgetnext" or "snmpwalk" instead of "snmpget" with the discard
stats object.  That will retrieve the first (or all) instance of this
object.

Dave


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