D-Link DSL-504 User Manual page 27

DSL-504 ADSL Router User's Guide
Advanced Filtering and Firewall (Screen #3)
In the third Advanced Filtering window you will define the terms or rule to be
used for filtering a specific IP address. Again you can supply a name for the
subset in the Comment field and click the box on the right to enable the Filter
Rule.
In the Pass or Block field select the action to be performed on the IP packets,
the default is Pass Immediately. Any blocked packets are simply dropped.
In the Direction field choose either In or Out from the pull down menu. Which
one you choose depends on whether you are blocking IP packets from coming into
the network (blocking a specific web site for example). Or alternatively you can
block packets originating at a specific IP address from leaving the LAN; this will
block Internet access for a specific host.
The Protocol field allows you to define the type of protocol of the packets to be
blocked.
You must next specify the Source and Destination IP Addresses as well as
their Subnet Mask. This will block the packets from or destined to any specified
IP address from passing through the Router.
21