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Page 121 / 229 Scroll up to view Page 116 - 120
Chapter 14 NAT
NBG6716 User’s Guide
121
14.5.3
Trigger Port Forwarding
Some services use a dedicated range of ports on the client side and a dedicated range of ports on
the server side. With regular port forwarding you set a forwarding port in NAT to forward a service
(coming in from the server on the WAN) to the IP address of a computer on the client side (LAN).
The problem is that port forwarding only forwards a service to a single LAN IP address. In order to
use the same service on a different LAN computer, you have to manually replace the LAN
computer's IP address in the forwarding port with another LAN computer's IP address.
Trigger port forwarding solves this problem by allowing computers on the LAN to dynamically take
turns using the service. The NBG6716 records the IP address of a LAN computer that sends traffic
to the WAN to request a service with a specific port number and protocol (a "trigger" port). When
the NBG6716's WAN port receives a response with a specific port number and protocol ("incoming"
port), the NBG6716 forwards the traffic to the LAN IP address of the computer that sent the
request. After that computer’s connection for that service closes, another computer on the LAN can
use the service in the same manner. This way you do not need to configure a new IP address each
time you want a different LAN computer to use the application.
14.5.4
Trigger Port Forwarding Example
The following is an example of trigger port forwarding.
Figure 84
Trigger Port Forwarding Process: Example
1
Jane requests a file from the Real Audio server (port 7070).
2
Port 7070 is a “trigger” port and causes the NBG6716 to record Jane’s computer IP address. The
NBG6716 associates Jane's computer IP address with the "incoming" port range of 6970-7170.
3
The Real Audio server responds using a port number ranging between 6970-7170.
4
The NBG6716 forwards the traffic to Jane’s computer IP address.
5
Only Jane can connect to the Real Audio server until the connection is closed or times out. The
NBG6716 times out in three minutes with UDP (User Datagram Protocol), or two hours with TCP/IP
(Transfer Control Protocol/Internet Protocol).
Jane’s computer
Real Audio Server
Port 7070
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Chapter 14 NAT
NBG6716 User’s Guide
122
14.5.5
Two Points To Remember About Trigger Ports
1
Trigger events only happen on data that is coming from inside the NBG6716 and going to the
outside.
2
If an application needs a continuous data stream, that port (range) will be tied up so that another
computer on the LAN can’t trigger it.
Page 123 / 229
NBG6716 User’s Guide
123
C
HAPTER
15
DDNS
15.1
Overview
DDNS services let you use a domain name with a dynamic IP address.
15.1.1
What You Need To Know
The following terms and concepts may help as you read through this chapter.
What is DDNS?
Dynamic Domain Name Service (DDNS) services let you use a fixed domain name with a dynamic
IP address. Users can always use the same domain name instead of a different dynamic IP address
that changes each time to connect to the NBG6716 or a server in your network.
Note: The NBG6716 must have a public global IP address and you should have your
registered DDNS account information on hand.
15.2
General
To change your NBG6716’s DDNS, click
Network > DDNS
. The screen appears as shown.
Figure 85
Dynamic DNS
Page 124 / 229
Chapter 15 DDNS
NBG6716 User’s Guide
124
The following table describes the labels in this screen.
Table 54
Dynamic DNS
LABEL
DESCRIPTION
Dynamic DNS
Select
Enable
to use dynamic DNS. Select
Disable
to turn this feature off.
Service Provider
Select the name of your Dynamic DNS service provider.
Host Name
Enter a host names in the field provided. You can specify up to two host names in the
field separated by a comma (",").
Username
Enter your user name.
Password
Enter the password assigned to you.
Apply
Click
Apply
to save your changes back to the NBG6716.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Page 125 / 229
NBG6716 User’s Guide
125
C
HAPTER
16
Static Route
16.1
Overview
This chapter shows you how to configure static routes for your NBG6716.
The NBG6716 usually uses the default gateway to route outbound traffic from computers on the
LAN to the Internet. To have the NBG6716 send data to devices not reachable through the default
gateway, use static routes.
For example, the following figure shows a computer (
A
) connected to the NBG6716’s LAN interface.
The NBG6716 routes most traffic from
A
to the Internet through the NBG6716’s default gateway
(
R1
). You create one static route to connect to services offered by your ISP behind router
R2
. You
create another static route to communicate with a separate network behind router
R3
connected to
the LAN.
Figure 86
Example of Static Routing Topology
16.2
IP Static Route Screen
Click
Network > Static Route
to open the
Static Route
screen.
WAN
R1
R2
A
R3
LAN

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