Re: Strange error in test program...

Hi Dave,

On Tue, Apr 8, 2008 at 12:53 PM, Dave Shield <D.T.Shield@liverpool.ac.uk> wrote:
> 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).

I suspected that for IF-MIB::ifIndex{x} = {y} the value {x} would be
in a strict consecutive order, that is, for your example this would
give:

IF-MIB::ifIndex.0 = 2
IF-MIB::ifIndex.1 = 3
IF-MIB::ifIndex.2 = 27

So I would iterate three times (from IF-MIB::ifNumber.0) and build an
index list with which I can build the 'IF-MIB::ifPhysAddress.{y}'
strings.

Very tedious, I know, but it works for SNMP v1, for which I must most
likely build in compatability.


> 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.

I'm building a second solution using this approach.

Thanks again!

-Kris

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