Chapter 15 Firewall
•LAN to WAN
These rules specify which computers on the LAN can access which computers or services on the WAN.
By default, the
•WAN to LAN
These rules specify which computers on the WAN can access which computers or services on the LAN.
Note: You also need to configure NAT port forwarding (or full featured NAT address mapping rules) to allow computers on the WAN to access devices on the LAN.
•WAN to Router
By default the
Note: You also need to configure the remote management settings to allow a WAN computer to manage the
You may define additional rules and sets or modify existing ones but please exercise extreme caution in doing so.
For example, you may create rules to:
•Block certain types of traffic, such as IRC (Internet Relay Chat), from the LAN to the Internet.
•Allow certain types of traffic, such as Lotus Notes database synchronization, from specific hosts on the Internet to specific hosts on the LAN.
•Allow everyone except your competitors to access a web server.
•Restrict use of certain protocols, such as Telnet, to authorized users on the LAN.
These custom rules work by comparing the source IP address, destination IP address and IP protocol type of network traffic to rules set by the administrator. Your customized rules take precedence and override the
15.6.2 Guidelines For Enhancing Security With Your Firewall
6Change the default password via web configurator.
7Think about access control before you connect to the network in any way.
8Limit who can access your router.
9Don't enable any local service (such as telnet or FTP) that you don't use. Any enabled service could present a potential security risk. A determined hacker might be able to find creative ways to misuse the enabled services to access the firewall or the network.
10For local services that are enabled, protect against misuse. Protect by configuring the services to communicate only with specific peers, and protect by configuring rules to block packets for the services at specific interfaces.
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