Figure 89 Limited Lan To Wan Irc Traffic Example; Table 38 Limited Lan To Wan Irc Traffic Example - ZyXEL Communications ZYWALL P1 User Manual

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. 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 89 Limited LAN to WAN IRC Traffic Example

Your firewall would have the following configuration.

Table 38 Limited LAN to WAN IRC Traffic Example

# SOURCE
1 192.168.1.7
2 Any
Default Any
• The first row allows the LAN computer at IP address 192.168.1.7 to access the IRC
service on the WAN.
• The second row blocks LAN access to the IRC service on the WAN.
• The third row is (still) the firewall's default policy of allowing all traffic from the LAN to
go to the WAN.
The rule for the CEO must come before the rule that blocks all LAN to WAN IRC traffic. If
the rule that blocks all LAN to WAN IRC traffic came first, the CEO's IRC traffic would
match that rule and the ZyWALL would drop it and not check any other firewall rules.
ZyWALL P1 User's Guide
Section 6.9 on page 113 for information on static DHCP).
DESTINATIO
SCHEDULE
N
Any Any
Any Any
Any Any
Chapter 9 Firewall
SERVICE ACTION
IRC Allow
IRC Drop
Any Allow
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