ZyXEL Communications ISG50-ISDN User Manual page 357

Integrated service gateway

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Now you configure a LAN1 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 235 Limited LAN to WAN IRC Traffic Example

Your firewall would have the following configuration.

Table 115 Limited LAN1 to WAN IRC Traffic Example 1

• The first row allows the LAN1 computer at IP address 192.168.1.7 to access the IRC service on

• The second row blocks LAN1 access to the IRC service on the WAN.

• The third row is the firewall's default policy of allowing all traffic from the LAN1 to go to the WAN.

Alternatively, you configure a LAN1 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 116 Limited LAN1 to WAN IRC Traffic Example 2

• The first row allows any LAN1 computer to access the IRC service on the WAN by logging into the

ISG50 with the CEO's user name.

• The second row blocks LAN1 access to the IRC service on the WAN.

• The third row is the firewall's default policy of allowing all traffic from the LAN1 to go to the WAN.

ISG50 User's Guide

Chapter 23 Firewall

Troubleshooting