netflow and samplicator

I understand that SolarWinds cant provide support for Samplicator - so I am asking the community at large.

I have just installed samplicator, and though I am getting Netflow from the samplicator server to my NTA, its not spoofing the IP address - everything is showing up as coming from the samplicator server.  Here is my command line -

/usr/local/bin/samplicate -S -f -s0.0.0.0 -p2055 <orion_NPM_ip>/2055.

I have about 15 (cisco) routers sending the the "NMS-2" (samplicator) server..

any thoughts?