Chapter 17 Firewall
Nebula Mobile Router User’s Guide
228
17.2.1 What You Can Do in this Chapter
• Use the General screen to configure the security level of the firewall on the Zyxel Device (Section 17.3
on page 228).
• Use the Protocol screen to add or remove predefined Internet services and configure firewall rules
(Section 17.4 on page 229).
• Use the Access Control screen to view and configure incoming or outgoing filtering rules (Section 17.5
on page 230).
• Use the DoS screen to activate protection against Denial of Service (DoS) attacks (Section 17.6 on
page 232).
17.3 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 149 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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