ZyXEL NBG4615 User Manual download pdf (Page 187)

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NBG4615 User’s Guide 187

CHAPTER 24

Firewall

24.1 Overview

Use these screens to enable and configure the firewall that protects your NBG4615 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 119 Default Firewall Action

24.1.1 What You Can Do

•Use the General screen to enable or disable the NBG4615’s firewall (Section 24.2 on page 189).

•Use the Services screen enable service blocking, enter/delete/modify the services you want to

block and the date/time you want to block them (Section 24.3 on page 189).

24.1.2 What You Need To Know

The following terms and concepts may help as you read through this chapter.

WAN

LAN

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ZyXEL NBG4615 User Manual Page 187

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