I know that SNMPv2c and SNMPv3 difference and my device is sending trap with
header inforamtions: version=3, msgMaxSize=0 (this is bad information and
stop processing),.... My device doesnt support SNMPv3 (encryption, etc). My
device's vendor thinks that this bad header should be ingnored and analyzed
such as SNMPv2c trap. Can I set up snmptrapd to force this behavior?
2009/3/4 Dave Shield <d.t.shi...@liverpool.ac.uk>
> 2009/3/4 Tomáš Harabin <harabin.to...@gmail.com>:
> > My SNMP device is sending traps, which have SNMPv3 version information in
> > SNMP trap header. But it is not fully SNMPv3 trap, it has only that
> > structure.
>
> What do you mean by "it only has that structure"?
>
> The difference between SNMPv2 requests and SNMPv3 requests
> is effectively just in the SNMP "header". The underlying SNMP
> PDU is the same in both cases.
> This is sometimes called an SNMPv2 PDU, and should not be
> confused with an SNMPv2c request (which is an SNMPv2 PDU
> plus a community-based header).
> Similarly, an SNMPv3 request is actually an SNMPv2 PDU,
> plus an SNMPv3-style header
>
>
>
> The two headers are significantly different, and will affect the processing
> quite dramatically. (e.g. decoding an encrypted trap).
>
>
> > My vendor argue with argument, that snmptrapd should be
> > configured to receive traps as a SNMPv2c regardless
> > SNMP trap header and structure.
>
> My immediate reaction was that your vendor is wrong.
> SNMPv2c and SNMPv3 are distinct protocols, and need
> to be handled differently.
>
> But it may well be that your vendor is referring to the internal
> PDU rather than the full SNMP request. In which case, they
> are quite correct.
>
> It's unclear exactly what problem you have got here.
>
> Dave
>
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