I'm looking for a commodity small LAN firewall / NAT box that would support a DHCP proxy feature on its *external* interface, and then send those DHCP requests to a specific host behind the arp.
My application is that I have a Windows 2003 domain controller that I would like to have act as a DHCP server for the computers in its domain. The clients would be in front of a firewall / NAT and the domain controller would be behind the firwall / NAT. I want to find an NAT that would present a DHCP proxy on its external interface and send those requests to the domain controller.
The existing firewall we have in place supports DHCP proxy only in a weak way. It also requires adding some additional software to the firewall that I don't particularly want running on the firewall. So I would run the DHCP proxy as a bypass to the existing firewall, just for DHCP only. No other traffic besides DHCP would go in or out of the new firewall.
I see that Netopia's Cayman 3500 series supports a DHCP relay from*internal* machines to an outside DHCP server. Unfortunately, that's the opposite of what I need, unless I am ready to turn the firewall 180 degrees around and make the clients the internal network and the domain controller the external. That would require some very iffy configuration to make secure, if it could be done. My preference is to find a similar off-the-shelf product that already incorporate DHCP proxy as I describe it. I would prefer to not have to install UNIX and do anything custom. Due to time limitations, off the shelf is what I need.
Does this product exist?