ZyXEL Communications VMG1312-B10C, Руководство пользователя

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VMG1312-B10C User’s Guide
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Firewall
14.1 Overview
This chapter shows you how to enable and configure the Device’s security settings. Use the firewall
to protect your Device and network from attacks by hackers on the Internet and control access to
it. By default the firewall:
• allows traffic that originates from your LAN computers to go to all other networks.
• blocks traffic that originates on 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 100
Default Firewall Action
14.1.1 What You Can Do in this Chapter
• Use the General screen to configure the security level of the firewall on the Device ( Section 14.2
on page 185 ).
• Use the Service screen to add or remove predefined Internet services and configure firewall
rules ( Section 14.3 on page 185 ).
• Use the Access Control screen to view and configure incoming/outgoing filtering rules ( Section
14.4 on page 188 ).
• Use the DoS screen to activate protection against Denial of Service (DoS) attacks (. Section 14.5
on page 190 ).
WAN
LAN
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4
1
2
A