Netgear Wndr4300v2 N750 Wifi Dual Band Gigabit Router Premium Edition User Manual

							Manage Your Network 
131  N750 WiFi Router
Note:For enhanced security, restrict access to as few external IP addresses 
as practical.
Select one of the following:
•Only This Computer. Allow access from a single IP address on the Internet. Enter 
the IP address to be allowed access. 
•IP Address Range. Allow access from a range of IP addresses on the Internet. Enter 
a beginning IP address and an ending IP address to define the allowed range. 
•Everyone. Allow access from any IP address on the Internet. 
7. Specify the port number for accessing the web management interface.
Normal web browser access uses the standard HTTP service port 80. For greater 
security, enter a custom port number for the remote web management interface. Choose 
a number from 1024 to 65535, but do not use the number of any common service port. 
The default is 8080, which is a common alternate for HTTP.
8. Click the Apply button.
Your changes take effect.
To use remote access:
1. Launch a web browser on a computer that is not on your home network.
2. Type your router’s WAN IP address into your browser’s address or location field followed by 
a colon (:) and the custom port number. 
For example, if your external address is 134.177.0.123 and you use port number 8080, 
enter http://134.177.0.123:8080 in your browser. 
						

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11
11.   Specify Internet Port Settings
You can use port forwarding and port triggering to set up rules for Internet traffic. You need 
networking knowledge to set up these features.
This chapter includes the following sections:
•Set Up Port Forwarding to a Local Server 
•Set Up Port Triggering  
						

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Set Up Port Forwarding to a Local Server
If your home network includes a server, you can allow certain types of incoming traffic to 
reach the server. For example, you might want to make a local web server, FTP server, or 
game server visible and available to the Internet.
The router can forward incoming traffic with specific protocols to computers on your local  network. 
 You can specify the servers for applications and you can also specify a d\
efault DMZ 
server to which the router forwards all other incoming protocols.
To forward specific incoming protocols:
1.  Decide which type of service, application, or game you want to provide.
2.  Find the local IP address of the computer on your network that will prov\
ide the service.
You can usually find this information by contacting the publisher of the \
application or user  groups or news groups.
3.  Assign the server computer a reserved IP address. 
The server computer must always use the same IP address.See Manage Reserved LAN IP Addresses  on page
  99.
4.  Launch a web browser from a computer or wireless device that is connecte\
d to the network.
5.  T
ype  http://www.routerlogin.net  or http://www.routerlogin.com .
A login screen displays.
6.  Enter the 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.
7.  Select  ADV
 ANCED > Advanced Setup > Port Forwarding/Port Triggering.
8. Leave the  Port Forwarding  radio button selected as the service type.
9.  T
o add a service that is in the  Service Name list:
a. Select a service from the list.
b.  In the  Server IP address  field, enter the port number
 .
c.  Click the  Add button. 
						

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The service displays in the list.
If the service that you want to add is not in the list, create a custom \
service. See Add a 
Custom Port Forwarding Service on page  134.
Add a Custom Port Forwarding Service
To add a custom service:
1. Find out which port number or range of numbers the application uses.
You can usually find this information by contacting the publisher of the \
application or user  groups or news groups.
2.  Launch a web browser from a computer or wireless device that is connecte\
d to the network.
3.  T
ype  http://www.routerlogin.net  or http://www.routerlogin.com .
A login screen displays.
4.  Enter the 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.
5.  Select  ADV
 ANCED > Advanced Setup > Port Forwarding/Port Triggering.
The Port Forwarding/Port Triggering screen displays.
6.  Leave the  Port Forwarding radio button selected as the service type.
7.  Click the  Add Custom Service  button.
8. In the Service Name field, enter a descriptive name. 
9.  In the Protocol field, select the protocol. 
If you are unsure, select TCP/UDP .
10.  In the  External port range field, enter the port numbers. 
11.  Specify the internal ports by one of these methods:
• Leave the Use the same port range for Internal port check box selected. 
						

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135  N750 WiFi Router
•Type the port numbers in the Internal Port Range field.
12. In the Internal IP address field, type the IP address, 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://www.routerlogin.net or http://www.routerlogin.com.
A login screen displays.
3. Enter the 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.
The Port Forwarding/Port Triggering screen displays.
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. Change the settings as needed.
9. Click the Apply button.
Your changes are saved.
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://www.routerlogin.net or http://www.routerlogin.com.
A login screen displays.
3. Enter the user name and password.
The user name is admin. The default password is password. The user name and 
password are case-sensitive. 
						

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136 N750 WiFi Router 
The BASIC Home screen displays.
4. Select ADVANCED > Advanced Setup > Port Forwarding/Port Triggering.
The Port Forwarding/Port Triggering screen displays.
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 Delete Service button.
The service is deleted.
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 router always gives your web server an IP address of 192.168.1.33. 
2. In the Port Forwarding/Port Triggering screen, configure the router to forward the HTTP 
service to the local address of your web server at 192.168.1.33. 
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 router. 
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.
How the 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 router.
•Destination port number. 80, which is the standard port number for a web server 
process.
2. Your router receives the message and finds your port forwarding rule for incoming port 80 
traffic. 
3. The router changes the destination in the message to IP address 192.168.1.123 and sends 
the message to that computer. 
						

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137  N750 WiFi Router
4. Your web server at IP address 192.168.1.123 receives the request and sends a reply 
message to your router.
5. Your 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 must use port forwarding to more than one local computer (but not 
simultaneously).
•An application must open incoming ports that are different from the outgoing port.
With port triggering, the router monitors traffic to the Internet from an outbound “trigger” port 
that you specify. For outbound traffic from that port, the router saves the IP address of the 
computer that sent the traffic. The 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 46.
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://www.routerlogin.net or http://www.routerlogin.com.
A login screen displays.
3. Enter the 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. 
The Port Forwarding/Port Triggering screen displays. 
						

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5. 
Select the  Port Triggering radio button.
6.  Click the  Add Service button.
7. In the Service Name (If Required)  field, type a descriptive service name. 
8.  From the Service User list, select a user option:
• Any (the default) allows any computer on the Internet to use this service\
. 
• Single address restricts the service to a particular computer
 . 
9.  From the Service T
 ype list, select TCP or UDP or TCP/UDP (both). 
If you are not sure, select TCP/UDP .
10.  In the  T
riggering Port  field, enter the number of the outbound traffic port that will open the 
inbound ports. 
11.  In the Service T
 ype, Starting Port, and Ending Port  fields, enter the inbound connection 
information.
12.  (Optional) In the  Port T
 riggering Timeout field, enter a value up to 9999 minutes. 
This value controls how long the inbound ports stay open when the router\
 detects no  activity
 . This value is required because the router cannot detect when the applica\
tion 
terminates.
13.  Click the  Apply button.
The service is now in the Portmap Table. 
Disable Port Triggering
You can disable port triggering. The port triggering services that you set up are saved but are  not used.
To disable port triggering: 
1.  Launch a web browser from a computer or wireless device that is connecte\
d to the 
network.
2.  T
ype  http://www.routerlogin.net  or http://www.routerlogin.com .
A login screen displays.
3.  Enter the user name and password. 
						

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 N750 WiFi Router
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  ADV
 ANCED > Advanced Setup > Port Forwarding/Port Triggering.
The Port Forwarding/Port Triggering screen displays.
5.  Select the Port T
 riggering radio button.
6. Select the Disable Port Triggering  check box.
If this check box is selected, the router does not use port triggering e\
ven if you specified 
port triggering settings.
Application Example: Port Triggering for Internet Relay Chat 
Some application servers, such as FTP and IRC servers, send replies to m\
ultiple port 
numbers. Using port triggering, you can tell the router to open more inc\
oming ports when a 
particular outgoing port starts a session.
An example is Internet Relay Chat (IRC). Your computer connects to an IRC server at  destination port 6667. 
 The IRC server not only responds to your originating source port but 
also sends an “identify” message to your computer on port 113. Using port triggering, you can 
tell the router, “When you initiate a session with destination port 6\
667, you must also allow 
incoming traffic on port 113 to reach the originating computer.” The following sequence 
shows the effects of this port triggering rule:
1.  Y
ou open an IRC client program to start a chat session on your computer. 
2. Y
our IRC client composes a request message to an IRC server using a desti\
nation port 
number of 6667, the standard port number for an IRC server process. Your computer then 
sends this request message to your  router.
3.  Y
our  router creates an entry in its internal session table describing this communica\
tion 
session between your computer and the IRC server. Your  router stores the original 
information, performs Network Address Translation (NAT) on the source address and port, 
and sends this request message through the Internet to the IRC server. 
4.  Noting your port triggering rule and observing the destination port numb\
er of 6667, your 
router  creates another session entry to send any incoming port 1

13 traffic to your computer. 
						

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140 N750 WiFi Router 
5. The IRC server sends a return message to your router using the NAT-assigned source port 
(for example, port 33333) as the destination port and sends an “identify” message to your 
router with destination port 113.
6. When your router receives the incoming message to destination port 33333, it checks its 
session table to see if a session is active for port number 33333. Finding an active session, 
the router restores the original address information replaced by NAT and sends this reply 
message to your computer.
7. When your router receives the incoming message to destination port 113, it checks its 
session table and finds an active session for port 113 associated with your computer. The 
router replaces the message’s destination IP address with your computer’s IP address and 
forwards the message to your computer.
8. When you finish your chat session, your router eventually senses a period of inactivity in the 
communications. The router then removes the session information from its session table 
and incoming traffic is no longer accepted on port numbers 33333 or 113.