Set Up A Firewall Rule For H.323 - ZyXEL Communications ISG50-ISDN User Manual

Chapter 7 General Tutorials
Figure 103 Configuration > Network > NAT > Add

7.9.3 Set Up a Firewall Rule For H.323

The default firewall rule for WAN-to-LAN traffic drops all traffic. Here is how to configure a firewall
rule to allow H.323 (TCP port 1720) traffic received on the WAN_IP-for-H323 IP address to go to
LAN1 IP address 192.168.1.56.
Click Configuration > Firewall > Add.
1
In the From field select WAN.
In the To field select LAN1.
Configure a name for the rule (WAN-to-LAN_H323 here).
Set the Destination to the H.323 device's LAN1 IP address object (LAN_H323). LAN_H323 is
the destination because the ISG50 applies NAT to traffic before applying the firewall rule.
Set the Service to H.323.
Click OK.
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ISG50 User's Guide