Chapter 13 Firewall
LTE Series User’s Guide
186
Figure 139 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.
The following table describes the labels in this screen.
Table 66 Security > Firewall > General
LABEL DESCRIPTION
IPv4
Firewall
Enable firewall protection when using IPv4 (Internet Protocol version 4).
IPv6
Firewall
Enable firewall protection when using IPv6 (Internet Protocol version 6).
High This setting blocks all traffic to and from the Internet. Only local network traffic and LAN to WAN service
(Telnet, FTP, HTTP, HTTPS, DNS, POP3, SMTP) is permitted.
Medium This is the recommended setting. It allows traffic to the Internet but blocks anyone from the Internet
from accessing any services on your local network.
Low This setting allows traffic to the Internet and also allows someone from the Internet to access services on
your local network. This would be used with Port Forwarding, Default Server.
Apply Click this to save your changes.
Cancel Click this to restore your previously saved settings.
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