User Manual

VisionNet 202ER ADSL Ethernet Router User’s Guide
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18 Configuring IP Filters
The IP filter feature enables you to create rules that control the
forwarding of incoming and outgoing data between your LAN and
the Internet. This chapter explains how to create IP filter rules.
Overview
The IP filter feature enables you to control the types of data being
passed between the Internet and your network. You can create IP
filter rules to block attempts by certain computers on your LAN to
access certain types of data or Internet locations. You can also
block incoming access to computers on your LAN.
When you define an IP filter rule and enable the feature, you instruct
the VisionNet 202ER to examine each data packet it receives to
determine whether it meets criteria set forth in the rule. The criteria
can include the size of the packet, the network or internet protocol it
is carrying, the direction in which it is traveling (for example, from
the LAN to the Internet or vice versa), the IP address of the sending
computer, the destination IP address, and other characteristics of
the packet data.
If the packet matches the criteria established in a rule, the packet
can be either accepted (forwarded towards its destination), or
denied (discarded), depending on the action specified in the rule.
Viewing Your IP Filter Configuration
To view your current IP filter configuration, launch Configuration
Manager, click
IP Filter in the Security tab. The IP Filter page
displays, as shown in Figure 50.
Figure 50. IP Filter Page
The IP Filter Configuration page displays global settings that you
can modify, and the IP Filter rule table, which shows all currently
established rules. See “Creating IP Filter Rules” on page 119 for a