Re: How to get IP of SNMP agent in SNMPv2 trap?

Hello somenathpal

Le 17/02/2014 10:11, somenathpal . a écrit :
> SNMPv2 trap pdu does not have snmp agent address in its header as it is
> present in SNMPv1 Trap pdu. So How a manager knows about the source of trap
> PDU in case of a Proxy sitting in between device and manager?

I think here is the answer you're looking for :

<cit. https://tools.ietf.org/html/rfc3584#section-3.1>
3.1. Translating SNMPv1 Notification Parameters to SNMPv2 Notification
     Parameters

   The following procedure describes how to translate SNMPv1
   notification parameters into SNMPv2 notification parameters:

[...]

   (4)  The SNMPv2 variable-bindings SHALL be the SNMPv1 variable-
        bindings.  In addition, if the translation is being performed by
        a proxy in order to forward a received trap, three additional
        variable-bindings will be appended, if these three additional
        variable-bindings do not already exist in the SNMPv1 variable-
        bindings.  The name portion of the first additional variable
        binding SHALL contain snmpTrapAddress.0, and the value SHALL
        contain the SNMPv1 agent-addr parameter.  The name portion of
        the second additional variable binding SHALL contain
        snmpTrapCommunity.0, and the value SHALL contain the value of
        the community-string field from the received SNMPv1 message
        which contained the SNMPv1 Trap-PDU.  The name portion of the
        third additional variable binding SHALL contain
        snmpTrapEnterprise.0 [RFC3418], and the value SHALL be the
        SNMPv1 enterprise parameter.
</cit.>

Regards,
-- 
Olivier Miakinen

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