PXE Network Question

We have our standard DHCP services running on Netware 6.5 Sp6. The PXE
services are on a totally different NetWare 6.5 sp6 server on a
different segment. Ip helper is used to get the DHCP broadcast messages
across segments. When booting off of the nic it does not get to the pxe
server at all unless we add a second ip helper address however that
seems to effect standard DHCP. How is this configuration accomplished?
In the lab with both services on the same segment there are no issues.
Is this something that can be addressed with multicast? How has everyone
else configured their network to accomodate this service? I apologize if
this information has been posted previously.

Thanks