sysco

Hi all, I currently have got a XEN Virtual environment and I have built WDS as one of the hosts. We've got a few different VLANs here, so I have ensure that the all machines that I'm testing reside within the same VLAN. Anyway, If I boot another VM on the same VLAN as WDS, the new VM is able to boot into PXE no problem. However, if I plug in a physical desktop or laptop onto the same VLAN, it doesn't pick up and unable to boot into PXE at all. I'm quite confused of how this can happened. AD/DHCP resides on a separated server that's on the same VLAN. not sure what I am missing here, please help. Cheers