ZyXEL Communications FMG3025-D10A ユーザーズマニュアル
FMG3024-D10A / FMG3025-D10A Series User’s Guide
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Firewall
13.1 Overview
Use the Device firewall screens to enable and configure the firewall that protects your Device and
network from attacks by hackers on the Internet and control access to it. By default the firewall:
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.
• 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).
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 68
Default Firewall Action
13.1.1 What You Can Do in this Chapter
• Use the General screen to enable or disable the Device’s firewall (
• Use the Services screen to view the configured firewall rules and add, edit or remove a firewall
rule (
• Use the Access Control screen to view and configure incoming/outgoing filtering rules (
).
• Use the DoS screen to enable or disable Denial of Service (DoS) protection (
).
13.1.2 What You Need to Know
Firewall
The Device’s firewall feature physically separates the LAN and the WAN and acts as a secure
gateway for all data passing between the networks.
gateway for all data passing between the networks.
WAN
LAN
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