ZyXEL g-2000 plusv2 Guia Do Utilizador

ZyXEL G-2000 Plus v2 User’s Guide

Chapter 11 Firewall Screens

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This chapter shows you how to configure your ZyXEL device firewall.

The web configurator is, by far, the most comprehensive firewall configuration tool your 
ZyXEL device has to offer. For this reason, it is recommended that you configure your 
firewall using the web configurator. SMT screens allow you to activate the firewall. CLI 
commands provide limited configuration options and are only recommended for advanced 
users, please refer to the Appendix for firewall CLI commands.

Firewall rules are grouped based on the direction of travel of packets to which they apply:

Note: The LAN includes both the LAN port and the WLAN.

By default, the ZyXEL device’s stateful packet inspection allows packets traveling in the 
following directions:

• LAN to LAN/ZyXEL device 

This allows computers on the LAN to manage the ZyXEL device and communicate 
between networks or subnets connected to the LAN interface.

• LAN to WAN

By default, the ZyXEL device’s stateful packet inspection blocks packets traveling in the 
following directions:

• WAN  to  LAN
• WAN to WAN/ZyXEL device 

This prevents computers on the WAN from using the ZyXEL device as a gateway to 
communicate with other computers on the WAN and/or managing the ZyXEL device.

You may define additional rules and sets or modify existing ones but please exercise extreme 
caution in doing so.

• LAN to LAN/ZyXEL device

• WAN to LAN

• LAN to WAN

• WAN to WAN/ZyXEL device