D-Link DSL-2740B User Manual page 73

Section 3 - Configuration
Port Mapping
Port Mapping supports multiple ports to PVC
and bridging groups. Each group will perform as
an independent network. To support this feature,
you must create mapping groups with
appropriate LAN and WAN interfaces. All
interfaces, by default are grouped to Default
Group.
Check the Enable virtual ports on box to
separate 4 LAN ports, otherwise they are
grouped as one interface: eth0.
Note: Only interfaces in the Default Group
can access router's web page.
Click the Add button to set Port Mapping setting.
D-Link DSL-2740B User Manual 73