Load Balancing -- preserve client IP?

Does the Flash Media Streaming Server need to know the client's IP address in a load-balanced environment? 

We will be doing straight-forward hardware load balancing -- we are not architecting the cluster for communication between Flash Media Servers.

We're trying to determine whether we need to configure the hardware load balancer to use SNAT to preserve the original client IP, which for us has ramifications about subnet choices for both the LB and server.

Thanks!