What's the "agent addr" for ? Is it mandatory ?

We have a problem getting our network management system to identify from
which source a trap comes

Our problematic traps from a natted ip, 12.155.xxx.xxx which shops up as
the
source on the IP level.

But inside the snoop (snp layer) there is a field called "agent addr",
this fiels is different
from the one above, showing a local lan address 192.168.xxx.xxx

Of course our NMS is using the field "agent addr" which is messing
things up

So I would really want to know:
- What is the real purpose of the field "agent addr"
- Is the field mandatory
- Is there a difference between snmpv1 and snmpv2c regarding this field
- In general, should there not be a configuration for the NMS to use one
  or the other a) use address in IP layer or b) use address in SNMP
layer
- In particular is an NMS surch as HPOV capable of this

Ragnar

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