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DVG-3016S/3032S User's Manual
3-4 NAT/DDNS
NAT Traversal
If your gateway is set up behind an Internet sharing device, you can select either the NAT or STUN protocol.
NAT Public IP: The IP address used by the gateway should be a private address. Furthermore, users
must set Virtual Server Mapping in the Internet sharing device. (For example, a virtual server is usually
defined as a Service Port, and all requests to this port will be redirected to this specified server's
private IP address).
The default ports of the gateway are listed below:
Listen Port (UDP): 5060
RTP Starting Port (UDP): Listen Port used for telephone communication.
DVG-3016: 9000~9095
DVG-3032: 9000~9191
NAT IP/Domain: Enter the NAT Server IP address (real public IP address of the Internet sharing
device); or enter a true URL (Uniform Resource Locator) when DDNS is used. Please refer to the
DDNS settings.
NOTE: If you are setting a public IP in this field, it has to be a static public IP, otherwise VoIP
communication may not be established properly. Please contact your ISP to check whether your Internet
connection has static public IP addresses.
Enable STUN Client: Using the STUN protocol prevents problems with setting the IP sharing function,
but some NATs do not support this protocol.
NOTE: If the NAT type is "Symmetric NAT," then the gateway is not able to traverse the NAT. It is not a
flaw of the gateway design, but rather a limitation of the STUN protocol.
STUN Server IP/Domain and Port: Enter the STUN server IP address and Listen Port number. You
can set two STUN server IPs separated by a semicolon.
Enable UPnP Control Point: This variable will enable the gateway's IP traffic to pass through an
Internet sharing device. This function only works when the Internet sharing device supports UPnP and
has it enabled.
D-Link Systems, Inc.
NAT/DDNS
13
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