ZyXEL Communications NXC5200 User Manual page 254

Chapter 18 Firewall
• 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 the firewall's default policy of allowing all traffic from the LAN to
go to the WAN.
Alternatively, you configure a LAN to WAN rule with the CEO's user name (say
CEO) to allow IRC traffic from any source IP address to go to any destination
address.
Your firewall would have the following configuration.
Table 91 Limited LAN to WAN IRC Traffic Example 2
#
1
2
3
• The first row allows any LAN computer to access the IRC service on the WAN by
logging into the NXC with the CEO's user name.
• The second row blocks LAN access to the IRC service on the WAN.
• The third row is 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 NXC would drop it and not check any other
firewall rules.
254
USER SOURCE DESTINATION
CEO Any Any
Any Any Any
Any Any Any
SCHEDULE SERVICE
Any IRC
Any IRC
Any Any
NXC5200 User's Guide
ACTION
Allow
Deny
Allow