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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