The Dmz Screen; The Alg Screen - ZyXEL Communications VMG892-B10A User Manual

Chapter 10 Network Address Translation (NAT)

10.5 The DMZ Screen

In addition to the servers for specified services, NAT supports a default server IP address. A default
server receives packets from ports that are not specified in the NAT Port Forwarding Setup
screen.
Figure 89 Network Setting > NAT > DMZ
The following table describes the fields in this screen.
Table 62 Network Setting > NAT > DMZ
LABEL
Default Server
Address
Apply
Cancel

10.6 The ALG Screen

Some NAT routers may include a SIP Application Layer Gateway (ALG). A SIP ALG allows SIP calls
to pass through NAT by examining and translating IP addresses embedded in the data stream.
When the Device registers with the SIP register server, the SIP ALG translates the Device's private
IP address inside the SIP data stream to a public IP address. You do not need to use STUN or an
outbound proxy if your Device is behind a SIP ALG.
Use this screen to enable and disable the NAT and SIP (VoIP) ALG in the Device. To access this
screen, click Network Setting > NAT > ALG.
Figure 90 Network Setting > NAT > ALG
166
DESCRIPTION
Enter the IP address of the default server which receives packets from ports that are not
specified in the NAT Port Forwarding screen.
Note: If you do not assign a Default Server Address, the Device discards all packets
received for ports that are not specified in the NAT Port Forwarding screen.
Click Apply to save your changes.
Click Cancel to restore your previously saved settings.
VMG8924-B10A and VMG8924-B30A Series User's Guide