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7
Firewall
Firewall is a set of security rules that prevents intruders from gaining access to
confidential and sensitive information. Its task is to ensure that only approved
communication happens and unauthorized communication is blocked and logged.
The primary purpose of a firewall is to enforce a security policy stating who can
communicate, with whom and in what way. The firewall accomplishes this task by
examining the traffic that passes through it, comparing each packet against a set of rules
programmed into it. It makes a decision based on factors such as sender address,
destination address, protocol and ports. This allows businesses to use less secure
applications on the protected networks and prevent all outsiders from ever gaining access
to these services.
Most firewalls, including D-Link firewalls, ensure that network traffic complies with
current protocol definitions. This can prevent poorly implemented services on the
protected servers and client software from being exposed to unexpected data, causing
them to hang or crash. In short, a firewall is the network's answer to poor host security.
7.1 Firewall Policies
7.1.1 Interface Configuration
Select Firewall → → → → Interface Configuration to configure the Firewall Interface
Configuration as explained below.
Typically, LAN is configured as a Trusted Interface and WAN is configured as
UnTrusted Interface.
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