D-Link DFL-1600 User Manual page 104

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3. Interfaces:
– adding the participating interfaces into the process.
In the "area0" configuration page:
Interfaces Add
General:
Interface: select "lan1" from the dropdown list.
("lan1" is assumed to have been defined in Ethernet interfaces)
Interface Type: select "Auto"
Metric/Bandwidth:
Either set a metric value or specify a bandwidth, e.g. 100Mbit.
Advanced:
Make sure that the configuration values listed here correspond with the
values used by the other OSPF neighbors in the network.
Then click OK.
Repeat this step to add interfaces "lan2" and "lan3".
4. Interface Group:
– placing "lan1" and "lan2" in a security equivalent interface group.
Interfaces Interface Groups
General:
Name: select a name for the group, e.g. "ifgrp-ospf1".
Check Security/Transport Equivalent check box.
Interfaces:
Select "lan1" and "lan2" from Available list and put them into the
Selected list.
Then click OK.
Make sure that the firewall's IP rules, which allowing traffics going
through these interfaces, use this interface group as source interface.
Interface:
Note
D-Link Firewalls User's Guide
Chapter 10. Routing
Add Interface Group: