Before You Begin; The Alg Screen; Figure 236 Voip With Multiple Wan Ip Addresses - ZyXEL Communications ZyWALL USG 100 Series User Manual

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 236 VoIP with Multiple WAN IP Addresses

Finding Out More
• See Section 5.4.21 on page 124
• See Section 6.8 on page 163
H.323 traffic.
• See Section 18.3 on page 332

18.1.3 Before 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.
330
for related information on these screens.
for a tutorial showing how to use the ALG for peer-to-peer
for ALG background/technical information.
ZyWALL USG 100/200 Series User's Guide