NetComm Dynalink NP800 Series User manual

(NP800 Series)
Port Forwarding Setup Guide

Port forwarding enables programs or devices running on your LAN to communicate with the
internet as if they were directly connected
This is most commonly used for VOIP ATA devices or online gaming (via game console or
computer)
Port forwarding works by “forwarding” a specific TCP or UDP port from the modem / router to
the computer or device you are using
You can also restrict which incoming connections will have the rule applied to it This enables
you to specify all incoming connections, from a specific sub-net or from an individual IP
address *
Different services and different games all use different TCP or UDP ports
You will need to consult any information supplied with your service or game in
order to find which ports need to be forwarded
You can only forward a port to one location (IP address)
In some cases, this may cause issues when multiple LAN devices (computers,
game consoles, or VOIP ATAs) attempt to use online gaming as same time or
make multiple VOIP service connections
In these cases, you would need to use an alternate port for any subsequent
connections after the first device
Please consult your VOIP provider or game manufacturer for assistance with this
* If supported by your model of modem / router .
Port Forwarding with the NP800 Series

Adding a Port Forwarding Rule
This guide will take you through the steps required to add a port forwarding rule to your
modem / router
Port Forwarding is required when applications require ports to be open to operate
correctly
You will need to know the port/s that you are trying to open, and also the IP Address of
the device (computer, VoIP ATA, etc ) that you are Port Forwarding to
Setting a Static IP Address
If you are Port Forwarding to a device other than a computer, you will need to contact the
manufacturer of the device to find out what it's IP Address is You will also need to ensure
this IP Address is a Static IP Address
If you are Port Forwarding to a computer, you will need to set a Static IP Address on your
computer, specifically on the network card of your computer
To do this try the following:
1. Select Start > All Programs > Accessories > Command Prompt
2. Enter 'ncpa.cpl' (without quotes) and press enter
3. Right click on either your wireless network connection or your local area
connection (depending on the type of connection you have to your router) and select
Properties
4. Select Internet Protocol ( CP/IP [V4 for Windows Vista or 7]) and press the
properties button
5. Select 'Use the following IP address' Enter the static IP address details An
example of a Static IP Address details you can use is as follows:
IP Address: 192 168 20 2
Subnet Mask: 255 255 255 0
Default Gateway: 192 168 20 1
6 Select 'Use the following DNS addresses' If you know your ISP's DNS addresses
use these or you can use the following addresses
Preferred (Primary) DNS: 192 168 20 1
Alternate (Secondary) DNS: 4 2 2 2
7 Press the Ok button on the Internet Protocol ( CP/IP) properties page and also on
the Local Area Connection Properties page

1 Navigate to http://192 168 20 1
in a web browser
2 If asked to login, the default username and password is "admin" and "admin" without
the quotes
3 Select Advanced on the left-menu then Port Fw from the top-menu
You should now see on screen the following:
Tick the check box for 'Enable Port Forwarding'
For Description, Enter a descriptive name for the port forwarding rule to be configured
In the above example, "Test" is the name for the rule
For Local IP, enter the IP address of the device you are port forwarding to
Configuring the NP800 Series Router

In above example, 192 168 20 2 is the IP address
For Protocol, Select the correct protocol type for your ports traffic, either TCP or UDP If
you are unsure what protocol your port requires, choose Both
In the above example, TCP is selected
In the above example, we have port forwarded the port 3000
For Local Port, Enter the local port number you wish to forward to your device
In above example, 3000 is the Port number
For Public Port, Enter the public port number you wish to forward to your device
In above example, 3000 is the Port number
After entering the above details, press the Add button
Once you click on Add button it will show you the Current Port Forwarding Table which
should resemble the following screenshot

Now press the Apply button
Port Forwarding for port 3000 to the device connected to the router using the IP address
192 168 20 2 has now been configured
For more information on Port Forwarding, Please visit www portforward com
Please note: Some services require more than one port forwarded You can do this by
specifying a sequential range of ports instead of just one
For example: 6881-6999
To do this, you would enter “6881” in the “Port Start” fields and “6999” in the “Port End”
fields for both the “External Packet” and “Forward to Internal Host” sections
You can only forward a port to one location (IP address)
In some cases, this may cause issues when multiple LAN devices (computers,
game consoles, or VOIP ATAs) attempt to use online gaming as same time or
make multiple VOIP service connections
In these cases, you would need to use an alternate port for any subsequent
connections after the first device
Please consult your VOIP provider or game manufacturer for assistance with this