Chapter 18 Firewall; Overview; What You Can Do - ZyXEL Communications MWR222 - V1.0 Manual

18.1

Overview

This chapter shows you how to enable and configure the firewall that protects
your MWR222 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).
Figure 94 Default Firewall Action
18.2

What You Can Do

• Use the General screen to enable or disable the MWR222's firewall.
MWR222 User's Guide
18. Firewall
151