Re: Regarding snmpv3 inform packet

Hi Bill Fenner,

Thanks a lot. I am very grateful to the portal for keeping us more
knowledgeable and interest on snmp alive.

Regards,
Pushpa.T

On Tue, Aug 27, 2019 at 7:20 PM Bill Fenner <[email protected]> wrote:

> On Fri, Aug 23, 2019 at 12:19 PM Pushpa Thimmaiah <
> [email protected]> wrote:
>
>> Hi All,
>>
>> I would like to understand messages exchanged between manager and agent
>> during snmpv3-inform.
>> Following is my understanding
>> Msg1. Agent to manager : Request for engineID
>> Msg2. Manager to Agent : Response with engineID
>> Msg3. Agent to Manager :  Send snmpv3 trap to manager
>> Msg4. Manager to Agent :  Send ACK to agent on authenticating and
>> receiving snmpv3 trap
>>
>> *Query:*
>> Varbinds in Message #3 and #4  are same. Varbinds of
>> Message#3(informRequest) is trap, but why manager sends same varbinds back
>> to Agent in Message#4 (get-response)
>>
>
> See section 4.2.7 of RFC3416:
> https://tools.ietf.org/html/rfc3416#section-4.2.7
>
>    Upon receipt of an InformRequest-PDU, the receiving SNMP entity
>    determines the size of a message encapsulating a Response-PDU with
>    the same values in its request-id, error-status, error-index and
>    variable-bindings fields as the received InformRequest-PDU.
>
>
> Presumably the intent of including the varbinds in the response is to
> allow the originator of the inform to ensure that the complete message was
> received, if it cares to do that much validation.
>
>   Bill
>
>

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