• See
Section 21.3 on page 407
21.1.3 Before You Begin
You must also configure the firewall and enable NAT in the ZyWALL to allow
sessions initiated from the WAN.
21.2 The ALG Screen
Click Configuration > 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.
Note: If the ZyWALL provides an ALG for a service, you must enable the ALG in order
to use the application patrol on that service's traffic.
Figure 303 Configuration > Network > ALG
ZyWALL USG 1000 User's Guide
for ALG background/technical information.
Chapter 21 ALG
405