Hi Dave,
Thanks for your prompt response and informative details. Just a
few questions more -
(1) Using mib2c utility of Net-SNMP , when I convert my MIB into a C
program which I would certainly compile and load it in my agent. Then
will it be able to respond to any custom parameter values ? Will I need
to modify this auto-generated C to populate needed information ?
Here my main concern is how do the values for custom fields get set. I
am planning to write a net-snmp module which would query and collect
data from my application and provide monitoring facility for my
application.
Thanks,
Sagar.
On Wed, 2006-11-22 at 10:48 +0000, Dave Shield wrote:
> On 22/11/06, Sagar Shukla <[EMAIL PROTECTED]> wrote:
> > (1) when we do getRequest, from where the information is pulled ?
> > Is this from the MIBs ?
>
> No.
> The MIB is best thought of as a "specification document".
> It describes what information is potentially available - how to refer
> to it, and how to interpret the results. But it does not automatically
> provide the data itself. That's the role of the agent.
>
> > (3) What is the role of snmp-agent and snmp-server and snmp-client ?
>
> "snmp agent" and "snmp server" are basically synonymous.
> This is the program that provides the requested information.
> But where does it get that information from?
> Typically, this will be retrieved from some other part of the system.
> Perhaps pulled out of the operating system kernel, or by interrogating
> another application. (And the same information may well be retrieved
> in different ways on different operating systems).
>
> The agent is a middle-man, who doesn't really know anything itself,
> but knows who to ask for any particular request. Think of this as a
> librarian - they typically won't know the answer to your question, but
> they know how to find it.
>
> The snmp client is the tool that talks to the agent, to ask the question.
>
> > (2) If this information is pulled from the MIBs then do we need to
> > develop a separate application/script to populate the MIBs with correct
> > values ?
>
> No - that's not how MIBs work. See above.
>
>
> > (4) For every MIB, is it necessary to have a loadable module ? Can we
> > just write few scripts to populate a MIB without having a loadable
> > module ?
>
> It's necessary to have some form of code, that can respond to requests
> for information from that MIB. This code can be a loadable module, it can
> be embedded within the agent itself, it can be a "subagent" (embedded
> within another application", it can be an external script.
> There are various ways of implementing a MIB - but it all comes back to
> the same bottom line - there needs to be *some* code somewhere, that
> knows how to provide these particular values.
>
> So it's not really accurate to talk about "populating" a MIB. Think of
> the MIB as a design document, which needs to be "implemented".
>
>
> Dave
>
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