User guide

Setting the Firewall Security Level
Chapter 10: Setting Your Security Policy 169
• Access from the WAN to network printers is blocked.
These rules are independent of the firewall security level.
You can easily override the default security policy, by creating user-defined firewall rules.
For further information, see Using Rules on page
172.
Setting the Firewall Security Level
The firewall security level can be controlled using a simple lever available on the Firewall
page. You can set the lever to the following states.
Table 31: Firewall Security Levels
This
level…
Does this… Further Details
Low Enforces basic control on
incoming connections,
while permitting all
outgoing connections.
All inbound traffic is blocked to the external
ZoneAlarm router IP address, except for ICMP
echoes ("pings").
All outbound connections are allowed.
Medium Enforces strict control on
all incoming connections,
while permitting safe
outgoing connections.
This is the default level
and is recommended for
most cases. Leave it
unchanged unless you
have a specific need for a
higher or lower security
level.
All inbound traffic is blocked.
All outbound traffic is allowed to the Internet
except for Windows file sharing (NBT ports 137,
138, 139 and 445).