> I am working with RH9, Net-SNMP 5.1.2, and the 802.11 MIB. I notice
> that the output of mib2c is different, depending on use of the UCD
> versus NET formats.
Yes - this is the difference between the old (v4) and new (v5) MIB APIs.
> Specifically, UCD generates names and OID's that
> are not generated for NET.
We've already discussed this back in July
(see the thread "Issues with the mib2c")
The v4 mib2c (and the old-api v5 config) generate a single template
for the whole of the specified subtree, leaving most of the details
up to the programmer.
The various main v5 mib2c configs each generate a more specialised
template, ignoring any MIB objects that aren't relevant to that
particular config. So the scalar config will *only* generate code
for scalar objects, and will ignore any tables. Similarly, the
various table configs will ignore any scalar objects. And both
of them ignore notifications.
> Now, in the c code file produced by mib2c for the UCD format,
Is this using the v4 version of the mib2c script, or the v5 mib2c
with the 'old-api' config?
> we see that dot11ResourceTypeIDName is described in the variable
>
> struct variable4 ieee802dot11_variables[] = {
>
> {DOT11RESOURCETYPEIDNAME, ASN_OCTET_STR, RONLY, var_ieee802dot11, 1, {1}},
>
> ...
>
> }
That looks like an 'old-api' config problem.
Please note that this config is something of a hack, and is *NOT*
suitable for serious use. If you're using a v5 release, then we
strongly, strongly, strongly recommend that you use the v5 MIB API.
If you prefer to use the v4 style, then you'll be *much* better off
installing the v4 mib2c script, and using that instead. The output
will be fine for use with the v5 agent - it's just the mib2c script
that struggles.
> Now, if I instead compile the MIB for the NET format, the variable does
> not get generated, at all.
Which mib2c config file did you use?
Saying "the NET format" is not sufficient - there are a dozen or more
different v5 mib2c config files, and which one you use will affect the
code that's produced.
> Why should the output of mib2c be different,
> based on a change in the selection of format, for the same input MIB?
Because that's the whole point of the config file - to define the
structure of the output. If the output was the same every time,
there'd be little point in having different configs in the first place! :-)
Dave
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