Chapter 11 Network Address Translation (NAT)
VMG3926-B10A User’s Guide
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11.5 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 84 Network Setting > NAT > DMZ
The following table describes the fields in this screen.
11.6 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 VMG registers with the SIP register server, the SIP ALG translates the VMG’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 VMG is behind a SIP ALG.
Use this screen to enable and disable the NAT and SIP (VoIP) ALG in the VMG. To access this
screen, click Network Setting > NAT > ALG.
Open Start Port The open port is a port (or a range of ports) that a server on the WAN uses when it sends
out a particular service. The VMG forwards the traffic with this port (or range of ports) to the
client computer on the LAN that requested the service.
Type a port number or the starting port number in a range of port numbers.
Open End Port Type a port number or the ending port number in a range of port numbers.
Open Protocol Select the transport layer protocol from TCP, UDP, or TCP/UDP.
OK Click OK to save your changes.
Cancel Click Cancel to exit this screen without saving.
Table 60 Port Triggering: Configuration Add/Edit (continued)
LABEL DESCRIPTION
Table 61 Network Setting > NAT > DMZ
LABEL DESCRIPTION
Default Server
Address
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 VMG discards all packets received
for ports that are not specified in the NAT Port Forwarding screen.
Apply Click Apply to save your changes.
Cancel Click Cancel to restore your previously saved settings.
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