Chapter 19 Firewall
AX/DX/EX/PX Series User’s Guide
376
19.2.1 What You Can Do in this Chapter
• Use the General screen to configure the security level of the firewall on the Zyxel Device (Section 19.3
on page 376).
• Use the Protocol screen to add or remove predefined Internet services and configure firewall rules
(Section 19.4 on page 377).
• Use the Access Control screen to view and configure incoming or outgoing filtering rules (Section 19.5
on page 378).
• Use the DoS screen to activate protection against Denial of Service (DoS) attacks (Section 19.6 on
page 381).
19.3 Firewall General Settings
Use the firewall to protect your Zyxel Device and network from attacks by hackers on the Internet and
control access to it. Use this screen to set the security level of the firewall on the Zyxel Device. Firewall
rules are grouped based on the direction of travel of packets. A higher firewall level means more
restrictions on the Internet activities you can perform. Click Security > Firewall > General to display the
following screen. Use the slider to select the level of firewall protection.
Figure 202 Security > Firewall > General
Note: LAN to WAN is your access to all Internet services. WAN to LAN is the access of other
computers on the Internet to devices behind the Zyxel Device.
When the security level is set to High, Telnet, FTP, HTTP, HTTPS, DNS, IMAP, POP3, SMTP,
and/or IPv6 ICMPv6 (Ping) traffic from the LAN are still allowed.
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