How are you physically connected to your ISP?
It may well be that you can't get DHCP direct from your ISP because of other hardware in the way.
-- Nigel Wade, System Administrator, Space Plasma Physics Group, University of Leicester, Leicester, LE1 7RH, UK E-mail : nmw@xxxxxxxxxxxx Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555