ZyXEL ZYWALL USG 100 User Guide - Page 109
Set Up a NAT Policy For H.323, Set Up a Firewall Rule For H.323 - port forwarding on
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Figure 43 Configuration > Network > ALG Chapter 5 Managing Traffic 5.6.1.2 Set Up a NAT Policy For H.323 In this example, you need a NAT policy to forward H.323 (TCP port 1720) traffic received on the ZyWALL's 10.0.0.8 WAN IP address to LAN IP address 192.168.1.56. 1 Click Configuration > Network > NAT > Add > Create New Object > Address and create an IPv4 host address object for the public WAN IP address (called WAN_IP-for-H323 here). Repeat to create an address object for the H.323 device's private LAN IP address (called LAN_H323 here). Configure a name for the rule (WAN-LAN_H323 here). You want the LAN H.323 device to receive peer-to-peer calls from the WAN and also be able to initiate calls to the WAN so you set the Classification to NAT 1:1. Set the Incoming Interface to the WAN interface. Set the Original IP to the WAN address object (WAN_IP-for-H323). Set the Mapped IP to the H.323 device's LAN IP address object (LAN_H323). Set the Port Mapping Type to Port, the Protocol Type to TCP and the original and mapped ports to 1720. Click OK. 5.6.1.3 Set Up a Firewall Rule For H.323 Configure a firewall rule to allow H.323 (TCP port 1720) traffic received on the WAN_IP-for-H323 IP address to go to LAN IP address 192.168.1.56. ZyWALL USG100-PLUS User's Guide 109