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Page 121 / 268 Scroll up to view Page 116 - 120
Chapter 10 Network Address Translation (NAT)
NBG4604 User’s Guide
121
Application Rules Summary
#
This is the number of an individual port forwarding server entry.
Active
This icon is turned on when the rule is enabled.
Name
This field displays a name to identify this rule.
Local Start/End
Port
Public Start/End
Port
This field displays the port number(s).
Server IP
Address
This field displays the inside IP address of the server.
Modify
Click the
Edit
icon to display and modify an existing rule setting in the
fields under
Add Application Rule
.
Click the
Remove
icon to delete a rule.
Table 48
Network > NAT > Application (continued)
LABEL
DESCRIPTION
Page 122 / 268
Chapter 10 Network Address Translation (NAT)
NBG4604 User’s Guide
122
10.5
NAT Advanced Screen
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 NBG4604 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 NBG4604's WAN port
receives a response with a specific port number and protocol ("incoming" port),
the NBG4604 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.
To change your NBG4604’s trigger port settings, click
Network > NAT
>
Advanced
. The screen appears as shown.
Note: Only one LAN computer can use a trigger port (range) at a time.
Figure 74
Network > NAT > Advanced
Page 123 / 268
Chapter 10 Network Address Translation (NAT)
NBG4604 User’s Guide
123
The following table describes the labels in this screen.
10.5.1
Trigger Port Forwarding Example
The following is an example of trigger port forwarding.
Figure 75
Trigger Port Forwarding Process: Example
1
Jane requests a file from the Real Audio server (port 7070).
Table 49
Network > NAT > Advanced
LABEL
DESCRIPTION
#
This is the rule index number (read-only).
Name
Type a unique name (up to 15 characters) for identification purposes. All
characters are permitted - including spaces.
Incoming
Incoming is a port (or a range of ports) that a server on the WAN uses
when it sends out a particular service. The NBG4604 forwards the traffic
with this port (or range of ports) to the client computer on the LAN that
requested the service.
Start Port
Type a port number or the starting port number in a range of port
numbers.
End Port
Type a port number or the ending port number in a range of port
numbers.
Trigger
The trigger port is a port (or a range of ports) that causes (or triggers)
the NBG4604 to record the IP address of the LAN computer that sent
the traffic to a server on the WAN.
Start Port
Type a port number or the starting port number in a range of port
numbers.
End Port
Type a port number or the ending port number in a range of port
numbers.
Apply
Click
Apply
to save your changes back to the NBG4604.
Reset
Click
Reset
to begin configuring this screen afresh.
Page 124 / 268
Chapter 10 Network Address Translation (NAT)
NBG4604 User’s Guide
124
2
Port 7070 is a “trigger” port and causes the NBG4604 to record Jane’s computer IP
address. The NBG4604 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 NBG4604 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 NBG4604 times out in three minutes with UDP (User Datagram
Protocol), or two hours with TCP/IP (Transfer Control Protocol/Internet Protocol).
10.5.2
Two Points To Remember About Trigger Ports
1
Trigger events only happen on data that is going coming from inside the NBG4604
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 125 / 268
NBG4604 User’s Guide
125
C
HAPTER
11
Dynamic DNS
11.1
Overview
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
NBG4604 or a server in your network.
Note: The NBG4604 must have a public global IP address and you should have your
registered DDNS account information on hand.

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