D-Link DI-206 - Manual (Page 83)

DI-206 ISDN Remote Router
Configuration and Management 71
Alternatively, you can set up filters that allow certain types of IP
packets to enter the LAN.
Filter State of Interface
The Filter State of Interface sub-menu lets you disable a filter, or, for
packets that have not met the corresponding criteria, to forward or
drop packets.
Each decision on handling packets is described below:
1. Disable – Will not apply a filter.
2. Forward – This allows the routing of a packet, even though it
has not met the criteria of the corresponding filter.
3. Drop – This drops (doesn’t allow routing for) a packet that has
not met the criteria for the corresponding filter.