Preserve source address from iRule

Hi

I have a VS which i'm using to duplicate SNMP traps to multiple pools. here is my very simple irule:

when CLIENT_ACCEPTED {

      set pool1 [HSL::open -proto UDP -pool serverpool1]

       HSL::send $pool1 [UDP::payload]

       set pool2 [HSL::open -proto UDP -pool serverpool2]

       HSL::send $pool2 [UDP::payload]

       set pool3 [HSL::open -proto UDP -pool serverpool3]

       HSL::send $pool3 [UDP::payload]

   }

the traps reach each pool ok, however the source IP address on the destination server is showing as the F5 internal IP. I need it to be the original source IP, the same way a normal VS clone pool would pass the traffic.

i've tried various settings on the VS and in my irule but i'm stuck.

any pointers?

Cheers

Mick