Use The Modem For Dhcp; Disable The Dhcp Server - D-Link DSL-321B User Manual

Section 3 – Configuration
You may also configure DNS settings when using the Modem in DHCP mode (Advanced > DNS Setup). When "Obtain DNS server address
automatically" is clicked under DNS Server Configuration on the DNS Setup window, the Modem will automatically relay DNS settings to properly
configured DHCP clients. To manually enter DNS IP addresses, click the "Use the following DNS server addresses" radio button and type in a
Preferred DNS Server and Alternate DNS Server in the fields provided. The manually configured DNS settings will be supplied to clients that are
configured to request them from the Modem.
Follow the instructions below according to which of the above DHCP options you want to use. When you have configured DHCP as you want, click
the Apply Settings button to commit the new settings.

Use the Modem for DHCP

To use the built-in DHCP server, tick the Enable DHCP Server check box in the DHCP Server Settings (Optional) section if it is not already selected.
The IP address pool settings can be adjusted. The DHCP IP Address Range starts with the lowest available IP address (default = 192.168.1.2). If
you change the IP address of the Modem this will change automatically to be 1 more that the IP address of the Modem. The DHCP IP Address
Range ends with the highest IP address number in the pool. Type in the DHCP Lease Time in the entry field provided. This is the amount of time in
hours that a workstation is allowed to reserve an IP address in the pool if the workstation is disconnected from the network or powered off.

Disable the DHCP Server

To disable DHCP, deselect the Enable DHCP Server check box in the DHCP Server Settings (Optional) section and click the Apply Settings button.
Choosing this option will gray out most of the setting options on this window and require that workstations on the local network be configured
manually or use another DHCP server to obtain IP settings.
If you configure IP settings manually, make sure to use IP addresses in the subnet of the Modem. You will need to use the Modem's IP address as
the Default Gateway for the workstation in order to provide Internet access.
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