Chapter 18 Firewall
VMG/XMG Series User’s Guide
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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 171 Security > Firewall > General
The following table describes the labels in this screen.
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 Appendix D on page 416 for some examples.
Note: Removing a protocol rule will also remove associated ACL rules.
Click Security > Firewall > Protocol to display the following screen.
Table 101 Security > Firewall > General
LABEL DESCRIPTION
Firewall Select Enable to activate the firewall feature on the Zyxel Device.
Low Select Low to allow LAN to WAN and WAN to LAN packet directions.
Medium Select Medium to allow LAN to WAN but deny WAN to LAN packet directions.
High Select High to deny LAN to WAN and WAN to LAN packet directions.
Cancel Click Cancel to restore your previously saved settings.
Apply Click Apply to save your changes.
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