ZyXEL Communications ZyWall 10W User Manual page 410

ZyWALL Series Internet Security Gateway
When the firewall is activated, the default policy allows all communications to the
Internet that originate from the LAN, and blocks all traffic to the LAN that
originates from the Internet.
You may deactivate the firewall in menu 21.2 or via the ZyWALL embedded web configurator. You may
also define additional firewall rules or modify existing ones but please exercise extreme caution in doing so.
See the firewall chapters for more information on the firewall.
27-6 Internet Access