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Note: When the security level is set to High, access to Telnet, FTP, HTTP, HTTPS, DNS, IMAP,
POP3, SMTP, and IPv6 Ping are still allowed from the LAN.
Click Security > Firewall to display the General screen.
Figure 165 Security > Firewall > General
The following table describes the labels in this screen.
Table 100 Security > Firewall > General
LABEL
Firewall
Low
Medium
High
Cancel
Apply
18.3 The Protocol Screen
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
Note: Removing a protocol rule will also remove associated ACL rules.
Click Security > Firewall > Protocol to display the following screen.
Chapter 18 Firewall
DESCRIPTION
Select Enable to activate the firewall feature on the Zyxel Device.
Select Low to allow LAN to WAN and WAN to LAN packet directions.
Select Medium to allow LAN to WAN but deny WAN to LAN packet directions.
Select High to deny LAN to WAN and WAN to LAN packet directions.
Click Cancel to restore your previously saved settings.
Click Apply to save your changes.
Appendix D on page 406
VMG/XMG Series User's Guide
for some examples.
265
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