D-Link DSL-322T User Manual page 28

DSL-322T ADSL Modem User Guide
non-TCP/IP port protocol link through the WAN interface. An IP
Unnumbered interface does not have an IP address and therefore
cannot be managed via Telnet or any other TCP/IP application.
Static IP
Static IP If you have selected the option in the IP Control pull-down
menu, type in the global IP address used for your WAN interface. Your
ISP should provide this IP address to you.
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