Changing the agent-address for SNMP v1 pdus

We are using Net-SNMP 5.3.0.1 and I have setup a "gateway"
to run snmptrapd and forward all traps it receives from internal
entities to an external managing entity. Everything is working fine
except that for SNMP Version 1 traps, the source/host address is
displaying as an internal address (it appears to be using the
agent-addr field from the SNMP v1 pdu) and not the external address of
the "gateway" that initiates the fowarding. For SNMP Version 2
traps/informs, there is no agent-addr field since the pdu has been
modified and the traps are being displayed correctly using the external
address of the gateway presumably being retrieved from the source field
of the IP header.

So I'm wondering how can I have snmptrapd modify the agent-addr field
for SNMP Version 1 traps before they get forwarded? I noticed that
snmptrapd supports the ability to execute a program when it receives a
trap using the traphandle directive. From the best I can gather, I
would have to capture all traps and reissue them with the correct agent
address for SNMP version 1 traps (I haven't tried this yet, but I'm
about to run some tests)? Is there a better way to accomplish the same
thing? Is there a way to just modify the agent-addr field for SNMP
version 1 traps?

Thanks,
Felix


      


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