Figure 181 Limited Lan To Wan Irc Traffic Example; Table 85 Blocking All Lan To Wan Irc Traffic Example - ZyXEL Communications ZYWALL 1050 - V2.00 EDITION 1 User Manual

Your firewall would have the following configuration.

Table 85 Blocking All LAN to WAN IRC Traffic Example

# USER
1 Any
Default Any
• The first row blocks LAN access to the IRC service on the WAN.
• The second row is the firewall's default policy that allows all traffic from the LAN to go to
the WAN.
The ZyWALL applies the firewall rules in order. So for this example, when the ZyWALL
receives traffic from the LAN, it checks it against the first rule. If the traffic matches (if it is
IRC traffic) the firewall takes the action in the rule (drop) and stops checking the firewall
rules. Any traffic that does not match the first firewall rule will match the default rule and the
ZyWALL forwards it.
Now suppose that your company wants to let the CEO use IRC. You can configure a LAN to
WAN firewall rule that allows IRC traffic from the IP address of the CEO's computer. You
can also configure a LAN to WAN rule that allows IRC traffic from any computer through
which the CEO logs into the ZyWALL with his/her user name. In order to make sure that the
CEO's computer always uses the same IP address, make sure it either:
• Has a static IP address,
or
• You configure a static DHCP entry for it so the ZyWALL always assigns it the same IP
address (see
Now you configure a LAN to WAN firewall rule that allows IRC traffic from the IP address of
the CEO's computer (192.168.1.7 for example) to go to any destination address. You do not
need to specify a schedule since you want the firewall rule to always be in effect. The
following figure shows the results of your two custom rules.

Figure 181 Limited LAN to WAN IRC Traffic Example

ZyWALL 1050 User's Guide
DESTINATIO
SOURCE
N
Any Any
Any Any
Section 10.1.4 on page 178
SCHEDULE SERVICE
Any IRC
Any Any
for information on DHCP).
Chapter 19 Firewall
ACTION
Deny
Allow
277