ZyXEL Communications P-660HN-F1A, User Manual

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Chapter 10 Firewalls
P-660HN-F1A User’s Guide
206
• WAN to WAN/ Router
By default the P-660HN-F1A stops computers on the WAN from managing the P-
660HN-F1A or using the P-660HN-F1A as a gateway to communicate with other
computers on the WAN. You could configure one of these rules to allow a WAN
computer to manage the P-660HN-F1A.
Note: You also need to configure the remote management settings to allow a WAN
computer to manage the P-660HN-F1A.
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 P-660HN-F1A’s default
rules.
10.5.2 Guidelines For Enhancing Security With Your Firewall
6
Change the default password via web configurator.
7
Think about access control before you connect to the network in any way.
8
Limit who can access your router.
9
Don'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.
10
For 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.
11
Protect against IP spoofing by making sure the firewall is active.
12
Keep the firewall in a secured (locked) room.