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Page 131 / 296 Scroll up to view Page 126 - 130
Chapter 11 Network Address Translation (NAT)
NBG334W User’s Guide
131
The following table describes the labels in this screen.
11.4
NAT Application Screen
Port forwarding allows you to define the local servers to which the incoming services will be
forwarded. To change your NBG334W’s port forwarding settings, click
Network > NAT
>
Application
. The screen appears as shown.
"
If you do not assign a
Default Server
IP address in the
NAT >
General
screen, the NBG334W discards all packets received for ports that are not
specified in this screen or remote management.
Refer to
Appendix F on page 277
for port numbers commonly used for particular services.
Table 51
Network > NAT > General
LABEL
DESCRIPTION
Enable Network
Address
Translation
Network Address Translation (NAT) allows the translation of an Internet protocol
address used within one network (for example a private IP address used in a local
network) to a different IP address known within another network (for example a
public IP address used on the Internet).
Select the check box to enable NAT.
Default Server
Setup
Default Server
In addition to the servers for specified services, NAT supports a default server. A
default server receives packets from ports that are not specified in the
Application
screen.
If you do not assign a
Default Server
IP address, the NBG334W discards all
packets received for ports that are not specified in the
Application
screen or
remote management.
Apply
Click
Apply
to save your changes back to the NBG334W.
Reset
Click
Reset
to begin configuring this screen afresh.
Page 132 / 296
Chapter 11 Network Address Translation (NAT)
NBG334W User’s Guide
132
Figure 74
Network > NAT > Application
The following table describes the labels in this screen.
Table 52
NAT Application
LABEL
DESCRIPTION
Game List Update
A game list includes the pre-defined service name(s) and port number(s). You can
edit and upload it to the NBG334W to replace the existing entries in the second
field next to
Service Name
.
File Path
Type in the location of the file you want to upload in this field or click
Browse...
to
find it.
Browse...
Click
Browse...
to find the.txt file you want to upload. Remember that you must
decompress compressed (.zip) files before you can upload them.
Update
Click
Update
to begin the upload process. This process may take up to two
minutes.
Add Application
Rule
Active
Select the check box to enable this rule and the requested service can be
forwarded to the host with a specified internal IP address.
Clear the checkbox to disallow forwarding of these ports to an inside server
without having to delete the entry.
Service Name
Type a name (of up to 31 printable characters) to identify this rule in the first field
next to
Service Name
. Otherwise, select a predefined service in the second field
next to
Service Name
. The predefined service name and port number(s) will
display in the
Service Name
and
Port
fields.
Page 133 / 296
Chapter 11 Network Address Translation (NAT)
NBG334W User’s Guide
133
11.4.1
Game List Example
Here is an example game list text file. The index number, service name and associated port(s)
are specified by semi-colons (no spaces). Use the name=xxx (where xxx is the service name)
to create a new service. Port range can be separated with a hyphen (-) (no spaces). Multiple
(non-consecutive) ports can be separated by commas.
Port
Type a port number(s) to be forwarded.
To specify a range of ports, enter a hyphen (-) between the first port and the last
port, such as 10-20.
To specify two or more non-consecutive port numbers, separate them by a comma
without spaces, such as 123,567.
Server IP Address
Type the inside IP address of the server that receives packets from the port(s)
specified in the
Port
field.
Apply
Click
Apply
to save your changes to the
Application Rules Summary
table.
Reset
Click
Reset
to not save and return your new changes in the
Service Name
and
Port
fields to the previous one.
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.
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 52
NAT Application (continued)
LABEL
DESCRIPTION
Page 134 / 296
Chapter 11 Network Address Translation (NAT)
NBG334W User’s Guide
134
Figure 75
Game List Example
11.5
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 NBG334W 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 NBG334W's WAN port receives a response with a
specific port number and protocol ("incoming" port), the NBG334W 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.
11.5.1
Trigger Port Forwarding Example
The following is an example of trigger port forwarding.
version=1
1;name=Battlefield 1942;port=14567,22000,23000-23009,27900,28900
2;name=Call of Duty;port=28960
3;name=Civilization IV;port=2056
4;name=Diablo I and II;port=6112-6119,4000
5;name=Doom 3;port=27666
6;name=F.E.A.R;port=27888
7;name=Final Fantasy XI;port=25,80,110,443,50000-65535
8;name=Guild Wars;port=6112,80
9;name=Half Life;port=6003,7002,27005,27010,27011,27015
10;name=Jedi Knight III: Jedi Academy;port=28060-28062,28070-28081
11;name=Need for Speed: Hot Pursuit 2;port=1230,8511-
8512,27900,28900,61200-61230
12;name=Neverwinter Nights;port=5120-5300,6500,27900,28900
13;name=Quake 2;port=27910
14;name=Quake 3;port=27660,27960
15;name=Rainbow Six 3: Raven Shield;port=7777-7787,8777-8787
16;name=Serious Sam II;port=25600-25605
17;name=Silent Hunter III;port=17997-18003
18;name=Soldier of Fortune II;port=20100-20112
19;name=Starcraft;port=6112-6119,4000
20;name=Star Trek: Elite Force II;port=29250,29256
21;name=SWAT 4;port=10480-10483
22;name=Warcraft II and III;port=6112-6119,4000
23;name=World of Warcraft;port=3724
Page 135 / 296
Chapter 11 Network Address Translation (NAT)
NBG334W User’s Guide
135
Figure 76
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 NBG334W to record Jane’s computer IP
address. The NBG334W 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 NBG334W 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 NBG334W times out in three minutes with UDP (User Datagram Protocol), or
two hours with TCP/IP (Transfer Control Protocol/Internet Protocol).
11.5.2
Two Points To Remember About Trigger Ports
1
Trigger events only happen on data that is going coming from inside the NBG334W 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.
11.6
NAT Advanced Screen
To change your NBG334W’s trigger port settings, click
Network > NAT
>
Advanced
. The
screen appears as shown.
"
Only one LAN computer can use a trigger port (range) at a time.

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