NetBoot/Restore Across Subnets using Windows DHCP Scope

Hi All, I'm working with the Win Admins to get NetBooting/restoring across subnets going using the DHCP scope options of the Windows DHCP server. This is unchartered territory for us here and we are having little success. Before we give in and stick the Xserve on the subnet of the majority of our Macs and just image on that subnet, is there anyone who knows if using the Windows DHCP scope to set the NetBoot Server and NetBoot File Name will work for the Macs, as it does not for us. 10.6.4 Server. Cheers, Dom