ZyXEL Communications Network Router wireless active fiber router Manual do Utilizador descarregar pdf (Página 71)

Chapter 8 Firewall

FSG1100HN User’s Guide

Firewall

Overview

Use these screens to enable and configure the firewall that protects your

FSG1100HN and your LAN from unwanted or malicious traffic.

Enable the firewall to protect your LAN computers from attacks by hackers on the

Internet and control access between the LAN and WAN. By default the firewall:

• allows traffic that originates from your LAN computers to go to all of the

networks.

• blocks traffic that originates on the other networks from going to the LAN.

The following figure illustrates the default firewall action. User A can initiate an IM

(Instant Messaging) session from the LAN to the WAN (1). Return traffic for this

session is also allowed (2). However other traffic initiated from the WAN is

blocked (3 and 4).

Default Firewall Action

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ZyXEL Communications Network Router wireless active fiber router Manual do Utilizador Página 71