The Security Tab - Firewall; Figure 5-22: Security Tab - Firewall - Linksys WRT54GC User Manual

Compact Wireless-G Broadband Router

The Security Tab - Firewall

The Firewall screen offers Filters and the option to Block WAN Requests. Filters block specific Internet data types
and block anonymous Internet requests. To enable a feature, select Enabled from the drop-down menu. To
disable a feature, select Disabled from the drop-down menu.
Firewall
• SPI Firewall Protection. Enable this feature to employ Stateful Packet Inspection (SPI) for more detailed
review of data packets entering your network environment.
• Block Anonymous Internet Requests. When enabled, this feature keeps your network from being "pinged," or
detected, by other Internet users. It also reinforces your network security by hiding your network ports. Both
functions of this feature make it more difficult for outside users to work their way into your network. This
feature is enabled by default. Select Disabled to allow anonymous Internet requests.
• Filter Multicast. Multicasting allows for multiple transmissions to specific recipients at the same time. If
multicasting is permitted, then the Router will allow IP multicast packets to be forwarded to the appropriate
computers. Select Enable to filter multicasting, or Disable to disable this feature.
• Filter Internet NAT Redirection. This feature uses port forwarding to block access to local servers from local
networked computers. Check the box to enable filter Internet NAT redirection, or uncheck the box to disable
this feature.
• Web Filters
Proxy. Use of WAN proxy servers may compromise the Gateway's security. Denying Filter Proxy will disable
access to any WAN proxy servers. To enable proxy filtering, click the checkbox.
Java. Java is a programming language for websites. If you deny Java, you run the risk of not having access to
Internet sites created using this programming language. To enable Java filtering, click the checkbox.
ActiveX. ActiveX is a programming language for websites. If you deny ActiveX, you run the risk of not having
access to Internet sites created using this programming language. To enable ActiveX filtering, click the
checkbox.
Cookies. A cookie is data stored on your computer and used by Internet sites when you interact with them. To
enable cookie filtering, click the checkbox.
Change these settings as described here and click the Save Settings button to apply your changes or Cancel
Changes to cancel your changes. Help information is shown on the right-hand side of the screen.
Chapter 5: Configuring the Compact Wireless-G Broadband Router
The Security Tab - Firewall

Figure 5-22: Security Tab - Firewall

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