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38 SBG1000 Wireless Cable Modem Gateway User Guide
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Configuration: Basic Gateway TCP/IP Wireless Print Server USB
Firewall > POLICY — basic Page
Use this page to select a predefined firewall policy for all packets processed by the SBG1000 firewall, as
described in “Setting the Firewall Policy” on page 36. Advanced users only can create a custom policy on the
Firewall > POLICY — advanced Page (see page 39). The FIREWALL POLICY setting None disables the firewall.
This is the default setting. You may consider using one of the SBG1000 pre-defined firewall policies to enhance
your network security.
You can click on the advanced tab to view the firewall rules that are applied for each firewall setting; high, medium,
and low.
The predefined policies provide outbound Internet access for computers on the SBG1000 LAN.
The SBG1000 firewall uses stateful inspection to allow inbound responses when there already is an outbound
session running corresponding to the data flow. For example, if you use a web browser, outbound HTTP
connections are permitted on port 80. Inbound responses from the Internet are allowed because an outbound
session is established. When required, the SBG1000 firewall can be configured to allow inbound packets without
first establishing an outbound session
.