NETGEAR C3700-100NAS Router Manual PDF (Setup & Configuration Guide)

Page 86 / 101 Scroll up to view Page 81 - 85

Specify Internet Port Settings

86

N600 WiFi Cable Modem Router Model C3700

If the application uses a range of ports, enter the ending port number of the range in the

External Ending Port

field.

11.

Type the port numbers in the

Internal Starting Port

and

Internal Ending Port

fields.

12.

Type the IP address in the

Internal IP address

field or select the radio button for an

attached device listed in the table.

13.

Click the

Apply

button.

The service is now in the list on the Port Forwarding/Port Triggering screen.

Edit a Port Forwarding Service



To edit a port forwarding entry:

1.

Launch a web browser from a computer or wireless device that is connected to the

network.

2.

Type

http://routerlogin.net

or

http://192.168.0.1

.

A login screen displays.

3.

Enter the modem router user name and password.

The user name is

admin

. The default password is

password

. The user name and

password are case-sensitive.

The BASIC Home screen displays.

4.

Select

ADVANCED > Advanced Setup > Port Forwarding/Port Triggering

.

5.

Leave the

Port Forwarding

radio button selected as the service type.

6.

In the table, select the radio button next to the service name.

7.

Click the

Edit Service

button.

The Ports - Custom Services screen displays.

8.

Specify changes to any of the following settings:

•

Service Name

. Type the service name.

•

Service Type

. If you are unsure, select

TCP/UDP

.

•

External Starting Port

. If the application uses a single port, enter the same port

number in the

External Ending Port

field. If the application uses a range of ports,

enter the ending port number of the range in the

External Ending Port

field.

•

Internal Starting Port

. By default, this is the same as the Internal Ending Port value.

•

Internal IP address

. Type the IP address in the Internal IP address field, or select the

radio button for an attached device listed in the table.

9.

Click the

Apply

button.

Your changes are saved.

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Specify Internet Port Settings

87

N600 WiFi Cable Modem Router Model C3700

Delete a Port Forwarding Entry



To delete a port forwarding entry:

1.

Launch a web browser from a computer or wireless device that is connected to the

network.

2.

Type

http://routerlogin.net

or

http://192.168.0.1

.

A login screen displays.

3.

Enter the modem router user name and password.

The user name is

admin

. The default password is

password

. The user name and

password are case-sensitive.

The BASIC Home screen displays.

4.

Select

ADVANCED > Advanced Setup > Port Forwarding/Port Triggering

.

5.

Select the

Port Forwarding

radio button as the service type

6.

In the table, select the radio button next to the service name.

7.

Click the

Delete Service

button.

Application Example: Make a Local Web Server Public

If you host a web server on your local network, you can use port forwarding to allow web

requests from anyone on the Internet to reach your web server.



To make a local web server public:

1.

Assign your web server either a fixed IP address or a dynamic IP address using DHCP

address reservation.

In this example, your modem router always gives your web server an IP address of

192.168.0.33.

2.

In the Port Forwarding/Port Triggering screen, configure the modem router to forward the

HTTP service to the local address of your web server at

192.168.0.33

.

HTTP (port 80) is the standard protocol for web servers.

3.

(Optional) Register a host name with a Dynamic DNS service, and specify that name in the

Dynamic DNS screen of the modem router. For more information, see

Dynamic DNS

on

page

62.

Dynamic DNS makes it much easier to access a server from the Internet because you

can type the name in the Internet browser. Otherwise, you must know the IP address that

the ISP assigned, which typically changes.

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Specify Internet Port Settings

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N600 WiFi Cable Modem Router Model C3700

How the Modem Router Implements the Port Forwarding Rule

The following sequence shows the effects of a port forwarding rule:

1.

When you type the URL www.example.com in your browser, the browser sends a web

page request message with the following destination information:

•

Destination address

. The IP address of www.example.com, which is the address of

your modem router.

•

Destination port number

. 80, which is the standard port number for a web server

process.

2.

Your modem router receives the message and finds your port forwarding rule for incoming

port 80 traffic.

3.

The modem router changes the destination in the message to IP address 192.168.0.123

and sends the message to that computer.

4.

Your web server at IP address 192.168.0.123 receives the request and sends a reply

message to your modem router.

5.

Your modem router performs Network Address Translation (NAT) on the source IP address,

and sends the reply through the Internet to the computer or wireless device that sent the

web page request.

Set Up Port Triggering

Port triggering is a dynamic extension of port forwarding that is useful in these cases:

•

An application uses port forwarding to more than one local computer (but not

simultaneously).

•

An application opens incoming ports that are different from the outgoing port.

With port triggering, the modem router monitors traffic to the Internet from an outbound

“trigger” port that you specify. For outbound traffic from that port, the modem router saves the

IP address of the computer that sent the traffic. The modem router temporarily opens the

incoming port or ports that you specify in your rule, and forwards that incoming traffic to that

destination.

Port forwarding creates a static mapping of a port number or range of ports to a single local

computer. Port triggering can dynamically open ports to any computer when needed and

close the ports when they are no longer needed.

Note:

If you use applications such as multiplayer gaming, peer-to-peer

connections, real-time communications such as instant messaging, or

remote assistance (a feature in Windows XP), enable Universal Plug

and Play (UPnP). See

Improve Network Connections with Universal

Plug and Play

on page

63.

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Specify Internet Port Settings

89

N600 WiFi Cable Modem Router Model C3700

Add a Port Triggering Service



To add a port triggering service:

1.

Launch a web browser from a computer or wireless device that is connected to the

network.

2.

Type

http://routerlogin.net

or

http://192.168.0.1

.

A login screen displays.

3.

Enter the modem router user name and password.

The user name is

admin

. The default password is

password

. The user name and

password are case-sensitive.

The BASIC Home screen displays.

4.

Select

ADVANCED > Advanced Setup > Port Forwarding/Port Triggering

.

5.

Select the

Port Triggering

radio button.

6.

Click the

Add Service

button.

7.

In the

Service Name

field, type a descriptive service name.

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Specify Internet Port Settings

90

N600 WiFi Cable Modem Router Model C3700

8.

In the

Service User

list, select

Any,

or select

Single address

and enter the IP address of

one computer:

•

Any

(the default) allows any computer on the Internet to use this service.

•

Single address

restricts the service to a particular computer.

9.

Select the service type, either

TCP

or

UDP

or

TCP/UDP

(both).

If you are not sure, select

TCP/UDP

.

10.

In the

Triggering Port

field, enter the number of the outbound traffic port that will open the

inbound ports.

11.

Enter the inbound connection port information in the

Connection Type

,

Starting Port

, and

Ending Port

fields.

12.

Click the

Apply

button.

The service is now in the Portmap table. You must enable port triggering before the

modem router uses port triggering for the service that you added. For information about

port triggering, see

Specify When to Use Port Triggering

on page

90.

Specify When to Use Port Triggering



To specify when to use port triggering:

1.

Launch a web browser from a computer or wireless device that is connected to the

network.

2.

Type

http://routerlogin.net

or

http://192.168.0.1

.

A login screen displays.

3.

Enter the modem router user name and password.

The user name is

admin

. The default password is

password

. The user name and

password are case-sensitive.

The BASIC Home screen displays.

4.

Select

ADVANCED > Advanced Setup > Port Forwarding/Port Triggering

.

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