User's Guide

Chapter 16 Firewall
EX3510-B0 User’s Guide
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Note: 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.
Click Security > Firewall to display the General screen.
Figure 121 Security > Firewall > General
The following table describes the labels in this screen.
16.3 Protocol Settings
You can configure customized services and port numbers in the Protocol screen. Each set of protocol
rules listed in the table are reusable objects to be used in conjunction with ACL rules in the Access
Control screen. For a comprehensive list of port numbers and services, visit the IANA (Internet Assigned
Number Authority) website. See Appendix C on page 297 for some examples.
Note: Removing a protocol rule will also remove associated ACL rules.
Click Security > Firewall > Protocol to display the following screen.
Table 77 Security > Firewall > General
LABEL DESCRIPTION
IPv4 Firewall Use the switch to turn on or off the firewall feature on the Zyxel Device for IPv4 traffic. When the
switch goes to the right , the function is enabled. Otherwise, it is disabled.
IPv6 Firewall Use the switch to turn on or off the firewall feature on the Zyxel Device for IPv6 traffic. When the
switch goes to the right , the function is enabled. Otherwise, it is disabled.
Low Select Low to allow traffic from LAN to WAN or from WAN to LAN.
Medium Select Medium to allow traffic from LAN to WAN but deny traffic from WAN to LAN.
High Select High to deny both directions of travel of packets (LAN to WAN and WAN to LAN).
Cancel Click Cancel to restore the default or previously saved settings.
Apply Click Apply to save your changes.