D-Link DSL-2740B User Manual page 91

Section 3 - Configuration
IP Address
The IP Address Access Control mode, if enabled, permits access
to local management services from IP addresses contained in the
Access Control List. If the Access Control mode is disabled, the
system will not validate IP addresses for incoming packets. The
services are the system applications listed in the Service Control
List.
D-Link DSL-2740B User Manual 91