D-Link DSL-2500U Quick Installation Manual - Automatically Checkbox).
Manual is about: ADSL2/2+ Router
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DSL-2500U
Quick Installation Guide
3. In the Physical layer section, specify the VPI and VCI in the relevant
fields, and then select a method of encapsulation from the
Encapsulation Mode drop-down list.
4. For the IPoA and IPoE connection types, fill in the IP Address,
Netmask, and Gateway IP Address fields in the IP settings section.
For the IPoE type, you can specify automatic assignment of these
parameters (to do this, select the Obtain an IP address
automatically checkbox).
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