On 8/12/06, HotBelgo <hotbelgo at gmail dot com> wrote:
> I need to set a PC-router that provides IP addresses to the PCs in my house
> using dhcp, but that relays the request from my set-top-box to my cable
> company's dhcp server - as the latter uses an entirely different IP range.
>

I don't know of any DHCP relay setup that'll only selectively forward,
and no DHCP server that'll selectively answer requests.

What you need to do is install a third interface for your set top box,
and bridge that interface to WAN.

-Chris