Re: Changing originator IP in trap/inform

On Wed, Jul 19, 2006 at 03:04:09PM +0100, Dave Shield wrote:
> On 19/07/06, santhosh.sundarasamy@wipro.com
> <santhosh.sundarasamy@wipro.com> wrote:
> > I have notification originator application, which uses Net-SNMP APIs
> > and runs as a separate process (not part of snmpd).
>
> Presumably this runs as an AgentX subagent - yes?
>
> > Net-SNMP APIs assigns the local IP address as the source IP. I am
> > trying to assign a different IP address as source IP by assigning a
> > different IP address for the variable 'localname' in snmp_session structure.
> > But this didn't work.
> >
> > Is there a way to change the source IP in the PDU before notification
> > originator sends the trap/inform?
>
> Which API are you using to generate the trap? In particular, are you
> using SNMPv1 or SNMPv2 syntax? If the latter, try appending a
> 'snmpTrapAddress' varbind to the payload list, with the address you
> want to use. I'm not sure whether that will do the trick or not, but
> it's worth a try.

It could work, there is sadly a misalignment in the code so if you have the
functions that converts from v2-notification to v1-trap and back and calls
them like:

res = v2tov1(v1tov2(v2tov1(v1tov2(inputV1))));

then res != inputV1.

Additionally, snmpd is wery keen on replacing the source address so it might
be that you loose anyway.

/MF

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