Does the ADSL gateway act as a DHCP host or client?
When you first install the ADSL gateway, it acts as a DHCP client to receive an IP address from the server. It retains that address permanently as your static IP address. Each time you connect to the Internet thereafter, the ADSL gateway acts as a DHCP host assigning an IP address to your computer (or to each computer in your home network, if you’re using Network Address Translation).