Running a PXE server without full DHCP

It was suggested I follow up my question here rather than on the forums.

I've since learned that the term for the thing I'd like to have is a "DHCP
Proxy Server".  Novell Zenworks, Solaris and IBM's AIX offer it, as well as
StorageSoft's PXE Server on Windows (no longer maintained and seems
limited to floppy).

A DHCP Proxy Server can respond to DHCP BOOTP requests without providing
the IP address - it relies on the other main DHCP server to do that.

In our case, at a University, we run a secure DHCP server which is fed
a list of valid MACs that are allowed on our network.  Rather than
duplicate the effort of that configuration on a PXE boot server, we'd
rather have it function as a DHCP Proxy.  It would respond to BOOTP
requests, send the "next-server" information to point to the TFTP server.
The main DHCP server would remain responsible for
controlling IP assignment (or whether to not assign an IP
if it is not an authorized client machine).

I'm also aware of Bootpd, but it doesn't offer support for allowing
a named DHCP server to provide the IP.

I have been searching for a way to make ISC DHCP offer the
limited proxy function, or locate an open source DHCP Proxy server,
but I don't see one available as yet.


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