ZyXEL Communications P-3202HN-Ba User Manual page 139

• LAN to LAN/ Router
These rules specify which computers on the LAN can manage the IAD (remote
management) and communicate between networks or subnets connected to the
LAN interface (IP alias).
Note: You can also configure the remote management settings to allow only a specific
computer to manage the IAD.
• LAN to WAN
These rules specify which computers on the LAN can access which computers or
services on the WAN.
By default, the IAD's stateful packet inspection drops packets traveling in the
following directions:
• 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 WAN/ Router
By default the IAD stops computers on the WAN from managing the IAD or
using the IAD 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
IAD.
Note: You also need to configure the remote management settings to allow a WAN
computer to manage the IAD.
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 IAD's default rules.
IAD User's Guide
Chapter 12 Firewalls
139