RE: Hostname vs. IP sent in traps

Hello,

Thanks very much for the explanation, Dave. We can now work a solution on
the management station end using the added hostname varbind you suggest.

Dave A.

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Dave
Shield
Sent: Tuesday, May 22, 2007 2:32 PM
To: David Arthur
Cc: [email protected]
Subject: Re: Hostname vs. IP sent in traps

On 22/05/07, David Arthur <[email protected]> wrote:
> I use the send_v2trap function to send traps from the embedded subagent.
> 1) Is there a way to send a hostname (rather than IP address) using the
> snmp_varlist_add_variable()/send_v2trap() scheme?

You can append whatever varbinds you like to the payload of the trap.
This could potentially include a string varbind, containing the hostname.
But always ensure that the varbinds listed in the MIB definition for the
trap come first.


> 2) If I use the snmptrap command and specify the hostname I am sending it
> from, the IP address always appears at the management station end. Is this
> behavior determined by the management station, or is the hostname resolved
> to an IP and *then* sent in the trap?

The standard structure of an SNMPv1 trap includes a field for the IP
address.
SNMPv2-style traps don't necessarily include this value, but there is a
standard varbind defined for it.
  But in both cases, this is an IP address, not a hostname.  So yes,
typically
the hostname will be resolved first, and this IP address then sent in the
trap.

Dave

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