Re: Configuring the net-snmp proxy with the same community string

On 08/11/2007, Rajendra, Singh <[email protected]> wrote:
> With net-snmp 5.4.1 running on it. I have configured A as to proxy some OIDs
> to B. .... I want to use the same community string for both A and B.

> Linux Box A (community string test) should respond to OIDS till .1.3.6.1 and
> for OIDS in subtree .1.3.6.1.4.1.562.3.21.6 A should proxy the request
> to linux box B.

That's no problem - just use the "proxy" directive in A's snmpd.conf file.
That's the natural way of using this mechanism.



> See the documentation below
> If you want to have the same OID tree proxied to multiple devices.... you need to
> use contexts.... [or]
> have a SNMPv1 community string map to a context for proxying. You will need
> a unique community string per proxied device.

You only need a unique community string per proxy if you are proxying the
*same* set of OIDs..    For example, if you wanted to query values in
the subtree
.1.3.6.1.4.1.562.3.21.6  from B *and* from A itself (and possibly from another
proxy C as well).
    When the main agent received a request for .1.3.6.1.4.1.562.3.21.6.1.2.3,
it would need some way of knowing which system (A, B or C) to report the
values from.  This is where the context/community comes in - different
contexts (or communities) can be used to distinguish the three cases.



That's not the situation here.
If it's only B that will be handling values from .1.3.6.1.4.1.562.3.21.6,
then the main agent (A) knows where to send such requests, so doesn't
need a hint from the community string.   You don't need to use the context
mechanism at all.   Just use a plain "proxy" directive, and things should
work as expected.


Dave

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