The firewall regulates the flow of data between the local network and
the Internet. Both incoming and outgoing data are inspected, then
either accepted and allowed to pass through your Gateway or rejected
and barred from passing through your Gateway, according to a flexible
and configurable set of rules. These rules are designed to prevent
unwanted intrusions from the outside, while allowing local network
users access to Internet services.
The firewall rules specify the type of services on the Internet that are
accessible from the local network and types of services in the local
network that are accessible from the Internet.
Each request for a service that the firewall receives is checked against
the firewall rules to determine whether the request should be allowed
to pass through the firewall. If the request is permitted to pass, all
subsequent data associated with this request or session is also allowed
to pass, regardless of its direction.
For example, when accessing a website on the Internet, a request
is sent to the Internet for this site. When the request reaches your
Gateway, the firewall identifies the request type and origin, such
as HTTP and a specific computer in the local network. Unless your
Gateway is configured to block requests of this type from this
computer, the firewall allows this type of request to pass to the
Internet.
When the website is returned from the web server, the firewall
associates the website with this session and allows it to pass;
regardless HTTP access from the Internet to the local network is
blocked or permitted.
90
SECURITY SETTINGS
06 / CONFIGURING
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