snmptrap not sending to the right port [I think]

I have snmptrap installed on 2 machines, the first running fedora and the second running CentOS.  I'm trying to send the same test trap from each to a third machine.  The trap from the first arrives correctly and the other one doesn't!  I'm running tcpdump on the receiver and for the trap that gets through I'm seeing:

16:06:45.410995 IP 192.168.1.110.39690 > poker.snmptrap:  Trap(30)  E:cmu.1.1 192.168.1.110 coldStart 20089044

When I send the identical trap from a different system I see:

16:12:16.854177 IP 192.168.1.105.57762 > poker.snmp:  Trap(30)  E:cmu.1.1 192.168.1.105 coldStart 19531423

So the second one IS being received but it looks like it's showing up on the snmp port rather than the trap port.  I'm guessing something must be misconfigured on the sender by have no idea what it might be.  Any thoughts?

-mark

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