Guidelines For Enhancing Security With Your Firewall - ZyXEL Communications P-793H User Manual

Chapter 9 Firewalls
• WAN to WAN/ Router
By default the P-793H v2 stops computers on the WAN from managing the P-
793H v2 or using the P-793H v2 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-793H v2.
Note: You also need to configure the remote management settings to allow a WAN
computer to manage the P-793H v2.
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-793H v2's default rules.

9.5.2 Guidelines For Enhancing Security With Your Firewall

Change the default password via web configurator.
6
Think about access control before you connect to the network in any way.
7
Limit who can access your router.
8
Don't enable any local service (such as telnet or FTP) that you don't use. Any
9
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.
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P-793H v2 User's Guide