Chapter 18 ALG
For example, you configure firewall and virtual server rules to allow LAN IP address A to receive calls through public WAN IP address 1. You configure different firewall and port forwarding rules to allow LAN IP address B to receive calls through public WAN IP address 2. You configure corresponding policy routes to have calls from LAN IP address A go out through WAN IP address 1 and calls from LAN IP address B go out through WAN IP address 2.
Figure 235 VoIP with Multiple WAN IP Addresses
Finding Out More
•See Section 5.4.21 on page 120 for related information on these screens.
•See Section 6.8 on page 159 for a tutorial showing how to use the ALG for
•See Section 18.3 on page 330 for ALG background/technical information.
18.1.3Before You Begin
Configure and enable NAT in the ZyWALL before you use the ALG.
18.2 The ALG Screen
Click Network > ALG to open the ALG screen. Use this screen to turn ALGs off or on, configure the port numbers to which they apply, and configure SIP ALG time outs.
"If the ZyWALL provides an ALG for a service, you must enable the ALG in order to perform bandwidth management on that service’s traffic.
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