Re: Strange error in test program...

On 08/04/2008, Kris van Rens <krisvanrens.list@gmail.com> wrote:
> > You are also assuming that ifTable entries will always be
> > in a strict consecutive sequence (starting from 1). That's
> > probably true for most simple systems, but it's not guaranteed.
> > It is perfectly valid to have 3 interfaces, with indexes 2, 3
> > and 27, for example.
>
>
> Mmm...ok. I could send another PDU to get the ifIndex.x list...this
> works but needs another PDU.

But how do you know which ifIndex.{x} values to ask for?
The {x} there is the same as the {x} in the ifPhysAddress.{x}
OID. So this is just moving the problem (unnecessarily).


This is where GETNEXT (or GETBULK) comes in.

In fact, with GETNEXT, you don't need to retrieve ifNumber.0
in the first place. Just start walking the ifPhysAddress column,
and stop when you fall off the end.

See"snmpwalk" for how this works.

GETBULK has the advantage that you can send one request
(for 'ifPhysAddress' with no index subidentifier) and ask for
the next N values.
The response would give you the full contents of this column,
regardless of the index values. But that only works with SNMPv2

Dave

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