D-Link Wireless ADSL2/2+ 4-port Ethernet Router DSL-2640U - Manual (Page 21)

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The following screen allows you to enter PPP username and password as well as
make any selections regarding your connection.
• Dial on demand: Allows you to manually connect to the Internet so you are
not permanently connected. Idle timeout timer is included.
• PPP IP extension: Used by some ISP’s. Check with your ISP to see if it is
required.
• Keep alive: Keeps you connected to your ISP even when no activity is
present for a certain period of time.
• Use static IP address: Select if you want to use a non-DHCP issued IP
address to connect to the Internet. If selected, you will be asked to enter
the static IP address.