On 6 October 2010 15:57,  <[email protected]> wrote:
>                I would like some
> information about the difference between ucd snmp 4.2 and net snmp 5.1.

Well the most important information about these two release
branches is that they are both obsolete.  No development or
support work is being done on either of them.


> Is there  some advantage to work with the net snmp's version?And why?

Advantages to the Net-SNMP code over UCD:
   -  several years of bug fixes and additional functionality
   -  some vague chance of support


> How did the snmp's agent change?

The main change was the switch to a handler-chain based approach
for implementing MIB modules, rather than the UCD "old-api" mechanism.
There's plenty of information about this on the project website, FAQ,
tutorials, etc

A number of the MIB modules have been re-written over the last eight
years to take advantage of the handler-based approach.  So the newer
releases will support more MIBs on a wider range of architectures.

Have a look at the NEWS and CHANGES files for the various releases
to get a feel for some of what has changed.



> What are the differences on:

>  -the data structures,
> -interfaces (API),
> -traps management,
> -real time constraints.


In general, we've tried to keep backward compatability as much as possible.
But the switch from UCD to Net-SNMP did involve things like changing the
location of header files (<ucd-snmp/xxx> to <net-snmp/xxx>).
   Also some of the data structures now have the prefix  "netsnmp_"
compared with the earlier UCD versions.   But the internal structures
are much the same.


I can't be any more specific, I'm afraid - it's been eight years since
we've done anything significant with the old UCD code.

Dave

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