3Com WL-537 User Manual page 67

Firewall 71
Only one computer on your network can use the special application at
any one time.
SPI Select Firewall from the main menu, then select the SPI to display the
SPI screen. SPI Screen
Check the Enable SPI and Anti-Dos Firewall protection check box to
enable SPI. When this feature is enabled, all incoming packets will be
blocked except for those types that you allow in the Stateful Packet
Inspection section.
Web Filters:You can select to filter Proxy, Java, ActiveX, and/or Cookies.
Click Save to save the setting.