As far as I can tell the unit acts as a DHCP/BOOTP (pseudo)forwarder when working in repeater mode so the DHCP request comes from the IP address of the unit. The consequence of this is that DHCP WILL NOT WORK if the unit is not in the same subnet as the DHCP clients - I am not even sure if it will work where the local router forwards the DHCP requests to a remote server.
Surely the DHCP requests should be forwarded as MAC broadcasts (to FF:FF:FF:FF:FF:FF) and to IP 0.0.0.0? The actual MAC address the request comes from is irrelevant as the requesting MAC address is contained in the DHCP data anyway (otherwise DHCP relay wouldn't work). The reply should then come back as a broadcast.
I can't see that this is any different from the unit working as a Wireless client and forwarding DHCP requests from one or more PC's on the wired side when these are forwarded as broadcasts.
I have a requirement to put the wireless kit on a separate subnet to the client PC's and this stops me doing this!
Thanks