Is there a way to keep the original sender's IP in forwarded traps

Arnold Wang <[email protected]>
Newsgroups gmane.network.net-snmp.user
Message-ID <[email protected]>
I have the following setup:

1.       I have machine A configured in a Cisco router as the trap receiver. The configuration in the router is as following:

snmp-server trap-source FastEthernet0/0

snmp-server enable traps config

snmp-server host ip_of_machine_A version 2c public  config

2.       I have installed and configured net-snmp 5.3.2.2 in machine A running RHEL 5. The configuration is as following:

# more /etc/snmp/snmptrapd.conf

snmpTrapdAddr               ip_of_machine_A

authCommunity log,execute,net             public

forward default ip_of_machine_B

3.       I have SNMPTT installed and configured in machine B to process the traps. The problem I'm running into is the machine B sees the traps are from machine A instead of the Cisco router, as I hoped.
Is it possible for machine A to keep/retain the IP of the Cisco router when forwarding the traps to machine B? Did I miss anything?
Thanks.

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