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Using the Advanced Gateway Setup Forwarding Option

Ubee DVW3201B Advanced Wireless Voice Gateway Subscriber User Guide

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July 2012

47

For example, to prevent all Telnet access into and across your LAN, you would enter the

Start

and

End

ports to be 23, select Both for

Protocol

, and click the

Enabled

selection

box.

Be careful using port filtering by port range as you may accidentally prevent traffic that

should pass through your network (for example, http or email). To see what applications

use each port, refer to

Using the Advanced Gateway Setup Forwarding Option on page 47

and click the

Port Map

button.

Steps

To configure port filters:

1.

Click the

Gateway

link from the top of the screen.

2. Click

Port Filtering

from the left side of the screen. The

Port

Filtering

fields are

explained following this screen example.

5.10

Using the Advanced Gateway Setup Forwarding Option

Port forwarding settings may be needed to resolve issues when data is sent from a local

host to the Internet, but the return path of expected data is not received by your local

host. Or, you have an application or service running on your local network (on local host)

Label

Description

Start Port

Defines the starting port number

End Port

Defines the ending port number.

Protocol

Selects the protocol type. Options are UDP, TCP, or BOTH.

Enabled

Activates the rule and filters out all traffic on the specified

ports.

Apply

Saves all screen changes when clicked.

Using the Advanced Gateway Setup Forwarding Option

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Ubee DVW3201B Advanced Wireless Voice Gateway Subscriber User Guide

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July 2012

that cannot be accessed from the Internet directly (for example, a request to a local audio

server). Port forwarding tells the cable modem to which computer on the local area

network to send the data. Here are some examples:



Xbox/PlayStation

–

Games/applications may require port forwarding.



Home Security Systems

–

Security systems that use the Internet may require port

forwarding.



Audio Servers/VoIP

–

Audio and VoIP applications and services may require port

forwarding to be fully enabled.

Note

If your host systems/applications do

not

have communications issues with the

Internet, forwarding is

not

needed.

You need two major items of information to setup forwarding:



The

IP address

of each local host system (for example, Xbox) for which you need to

setup a port forwarding rule. See the discussion below for how to obtain IP addresses.



The

port numbers

that a local host’s application listens to for incoming requests/data

(for example, a game or other service). These port numbers should be available in the

documentation associated with the application. You may also refer to

http://portforward.com

for more information.

The following tasks are recommended as best practices for setting up forwarding rules:

a.

Enable UPnP (Universal Plug and Play). This may resolve the issue you have

without the need to set forwarding rules.

i.

Access the Web interface of the cable modem, see

Accessing the Web

Interface on page 17

.

ii.

Select

Gateway

from the top menu, then

Options

from the left menu.

iii.

Select the option to enable UPnP.

iv.

Test your local host/application (for example, Xbox) to determine correct

functionality. If it is still not properly communicating, continue with forwarding.



Using the Client List Option on page 83

–

Use this option to obtain the MAC and IP

address of the internal host for which you are setting up a forwarding rule. You also

need these for the following task.



Using the DHCP Static Lease Option on page 39

–

Before setting up forwarding, we

recommend that you assign a Static IP lease to the client/host to which you are setting

up forwarding. This way, the IP does not change and disrupt your forwarding rules.

For example, if you are hosting a Web server in your internal network and you wish to

setup a forwarding rule for it, you should assign a static IP lease to that system to

keep the IP from renewing and disrupting the forwarding rule.

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Using the Advanced Gateway Setup Forwarding Option

Ubee DVW3201B Advanced Wireless Voice Gateway Subscriber User Guide

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July 2012

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5.10.1

Setting Up Port Forwarding for an Xbox Example:

To setup Port Forwarding, use the following procedure. See the following page for screen

field definitions.

Steps

To set up port forwarding for an Xbox:

1.

Click the

Gateway

link from the top of the screen.

2. Click

Forwarding

from the left side of the screen.

The following example shows how to setup a single Xbox running Modern Warfare

2.

Since multiple ports are used for the Xbox and the Modern Warfare 2 game, a

separate forwarding rule is set up for each port. (Multiple ports and forwarding rules

may not be required for other applications.) Note the following:



Enter the Xbox IP address in the Local IP field. Notice how the same IP is entered

in 4 rows, one row for each port used by the Xbox.



Define ports used by the Xbox in the Internal Port field. Define the same ports

used by the Xbox in the External Port Start and End fields.



You can set up applications/services to listen on one internal port. External Internet

users who want to access that application, address it using an external port, such

as an Audio server. In the screen example below, Internal Ports are the ports to

which local servers listen. External Ports are the ports that the cable modem

listens to from the WAN.



Create Port Forwarding rules per port. Therefore, a rule set up for port 53 only

works for port 53. A port can be used only 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.

Using the Advanced Gateway Setup Forwarding Option

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Label

Description

Internal

Index

Displays the Index number of the rule.

Local IP

Defines the last digits of the IP address of the local LAN

device to which the forwarding rule applies,. For example, an

Xbox or PC.

Start Port

Defines the starting port number listened to by the server host

located in your LAN.

End Port

Defines the ending port number listened to by the server host

located in your LAN.

External

Public Interface IP

Designates another router on the network through which to

forward data. Normally, this field is not modified.

Start Port

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

to the Internet.

End Port

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

Internet.

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

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

Selects the protocol type. Options are UDP, TCPIP, or Both.

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Using the Advanced Gateway Setup Port Triggering Option

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5.10.2

Viewing Port Maps

Port maps display a list of common applications and the port to which they are assigned.

This option is available from the Forwarding screen.

Steps

To view assigned port maps:

1.

On the Advanced Gateway - Forwarding screen, click

Port Map

at the bottom of the

screen.

2. View the application names and pre-assigned port numbers.

3. Click

to close the Port Map window.

5.11

Using the Advanced Gateway Setup Port Triggering Option

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.

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 send a

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

service to a

single

LAN IP address.

Enabled

Enables this rule when checked.

View Additional Rules

Displays rules 11-20 when selected from the drop-down list, if

they exist. A total of twenty rules are supported.

Apply

Saves all screen changes when clicked.

Port Map

Shows a list of common applications and their ports.