Systems Deployment

I am using Ghost 8.0 coperate edition and trying to deploy server images using mulitcast. I have been successful using a boot floppy. but when I use PXE boot I have gotten to the point of the client booting up and searching for the session I have set up using the 3COM boot services. The client will search for the multicast session but the Multicast server will never see the client. Would anyone have an idea what step is missing? At this point I am just using two computer and a single switch, so no routing is involved.
Thanks for your help.