RE: migrate from V2 to V3

On Wed, 2005-12-14 at 09:42 +0800, Jim Su wrote:
> Thanks for the reply.
>
> The agent is based on the Net-SNMP 5.1.2.
> Your reply confirmed that there's not much change in
> agent side other than to set --with-default-snmp-version=3,
> to include the V3 mibs such as: SNMP-TARGET-MIB.txt ,
> SNMP-USER-BASED-SM-MIB.txt , SNMP-VIEW-BASED-ACM-MIB.txt,

No - those MIBs have absolutely nothing to do with the
option "--with-default-snmp-version".

> (may be the configure option automatically includes these),

They almost certainly will be included - the View Based ACM
forms the mechanism for *all* access control (including SNMPv1
and SNMPv2c). Unless you ran a *very* stripped down "configure"
originally, all the SNMPv3 framework will already be in place.


--with-default-snmp-version is only relevant to the client
side tools. The agent doesn't use it at all.


> The manager (client) is an inherited in house application to
> monitor the interface counter, CPU and memory usage.

Built using which SNMP toolkit? Net-SNMP, or something else?


> It takes the configuration from front end UI then insert to
> the schedule for polling by the defined interval constantly.
> The in house library call the snmp_sess_init, snmp_sess_open,
> snmp_sess_session , read_objid , snmp_add_null_var ,
> snmp_sess_synch_response , snmp_sess_close etc. to get the
> values of desired counters.

That'd be using Net-SNMP then :-)


> I guess to make it work with V3 the security data such as
> username, authentic key, and private key (parameters required
> by V3 application - snmpget, snmpwalk, etc.) are needed and
> passed to the structure in the pdu, correct?

Yes.


> So all I need to do is to find out the V3 specific fields
> in the pdu structure and fill them up, correct?

Correct.
See 'snmplib/snmp_parse_args.c' for how this is done with the
standard Net-SNMP tools.


> How about the engine ID, authprotocal, and privprotocal?

The engineID will be discovered automatically, you don't
need to worry about that.
You *do* need to set the authentication and privacy protocols.
Again, see 'snmp_parse_args()'

Dave


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