Chapter 11 Network Address Translation (NAT)
PMG5317-T20A 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 75 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 GPON Device registers with the SIP register server, the SIP ALG translates the GPON
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 GPON Device is behind a SIP ALG.
Use this screen to enable and disable the ALGs in the GPON Device. 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 GPON Device 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, or UDP.
OK Click OK to save your changes.
Cancel Click Cancel to exit this screen without saving.
Table 51 Port Triggering: Configuration Add/Edit (continued)
LABEL DESCRIPTION
Table 52 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 GPON Device 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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