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DDW3612 Subscriber User Guide

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July, 2010

Setup Port Forwarding (XBOX example):

To setup Port Forwarding, use the following procedure:

1.

Access the web interface. Refer to

page 7

, if needed.

2.

Click the

Gateway

link from the top of the screen. Click

Forwarding

from the left

side of the screen. The

Forwarding

fields are explained following this screen

example.

3. The example below shows how to setup an XBOX running Modern Warfare 2.

Since multiple ports are used for XBOX and this particular game, a separate

forwarding rule is setup for each port. Multiple ports and forwarding rules may not

be the case for other applications, however. Note the following:



The

XBOX IP

is entered in the Local IP field. Notice how the IP is entered in 4

rows, one row for each port used by the XBOX.



The

ports

used by the XBOX are defined in the Internal Port field. The same

ports used by the XBOX are also defined in the External Port Start and End

fields.



Keep in mind that you may want to setup some applications/services to listen

on one internal port, while external internet users who want to access that

application address it using another port, such as an Audio server. Using the

screen example below,

Internal Ports

are the ports that local servers listen to.

External Ports

are the ports that the cable modem listens to from the WAN.



Port Forwarding rules are created per port. So a rule set up for port 53 will only

work for port 53. A port can only be used by one program at a time.



For detailed information on port forwarding, including how to set it up for

specific applications using specific network devices (for example, cable

modems), refer to:

http://portforward.com

or consult your host device or

application user manual.

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Label

Description

Index

Displays the Index number of the rule.

Local IP

Enter the last digits of the IP address of the server for which to

setup the forwarding rule.

Internal Port

Enter the port number listened to by the server host located in

your LAN.

Public Interface IP

Normally, this field is not modified unless you wish to designate

another router on the network to forward data through.

Ext. Start Port

Define the port number to start the range of ports to publish to

the Internet.

Ext. End Port

Define the port number to end the range of ports published to

Internet.

Note: Be very careful with ranges. Ports within a range will not

be usable by other applications that may require them. It is

common and safer to enter the same port number as the start

and end of the range.

Protocol

Select the protocol type, UDP, TCPIP, or Both.

Enabled

Select to enable this rule.

Apply

Click to save.

Port Map

Click to show a list of common applications and their ports.

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DDW3612 Subscriber User Guide

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July, 2010

3.7.12

Gateway - Port Triggering

The

Port Triggering

option allows you to configure dynamic triggers to specific devices

on the LAN. This allows for special applications that require specific port numbers with

bi-directional traffic to function properly. Applications such as video conferencing,

voice, gaming, and some messaging program features may require these special

settings. Refer to

page 35

for more information on how to setup Port Triggering.

1.

Access the web interface. Refer to

page 7

, if needed.

2. Click the

Gateway

link from the top of the screen.

3. Click

Port Triggering

from the left side of the screen. The

Port Triggering

fields

are explained following this screen example.

Label

Description

Trigger Range

The trigger port is a port (or a range of ports) that triggers the

router to record the IP address of the LAN computer that sent

the traffic to a server on the WAN.

Start Port

Enter a port number or the starting port number in a range of

port numbers.

End Port

Enter a port number or the ending port number in a range of

port numbers.

Target Range

Target Range is a port (or a range of ports) that a server on the

WAN uses when it responds to service requests. The router

forwards the traffic with this port (or range of ports) to the client

computer on the LAN that requested the service

Start Port

Enter a port number or the starting port number in a range of

port numbers.

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July, 2010

35

3.7.13

Additional Information - Port Triggering

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

rule to forward a service to the IP address of a LAN side host. The problem is that port

forwarding forwards a service to a

single

LAN IP address.

With port triggering, we define 2 kinds of ports: Trigger Port and Target Port. Trigger

port is defined as the service request with a specific destination port number sent from

a LAN side host. Target Port is defined as the ports this specific application requires a

LAN host to listen to. Thus, the server returns responses to these ports.

Example:

1.

John requests a file from the Real Audio server (port 7070).

Port 7070 is a “trigger”

port and causes the wireless router to record John’s computer IP address. The

DDW3612 Wireless Cable Modem Gateway associates John's computer IP

address with the "target" port range of 6970-7170.

2. The Real Audio server responds to a port number ranging between 6970-7170.

3. The DDW3612 Wireless Cable Modem Gateway forwards the traffic to John’s

computer IP address.

4. Only John can connect to the Real Audio server until the connection is closed or

times out.

End Port

Enter a port number or the ending port number in a range of

port numbers.

Protocol

Define the protocol type for this rule, UDP, TCP, or Both.

Enable

Click to activate this rule.

Apply

Click to save.

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3.7.14

Gateway - Pass Through

The

Pass Through

option allows you to configure a pass through table. Devices in

the pass through table are treated as bridge devices, storing and forwarding data

between LAN interconnections.

1.

Access the web interface. Refer to

page 7

, if needed.

2. Click the

Gateway

link from the top of the screen.

3. Click

Pass Through

from the left side of the screen. The

Pass Through

fields are

explained following this screen example.

Label

Description

Index

Index number of the pass through rule.

MAC Address

Input the host’s MAC address.

Clear

Select the box to delete this rule.

Apply

Click to save.