Netgear C7000 Nighthawk Ac1900 Wifi Cable Modem Router User Manual

							Manage Your Network 
91  Nighthawk AC1900 WiFi Cable Modem Router
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 Settings > Dynamic DNS.
5. Change your DDNS account settings as necessary.
6. Click the Apply button.
Your changes are saved.
Remote Management
The remote management feature lets you access your modem router over the Internet to 
view or change its settings. You need to know the modem router’s WAN IP address to use 
this feature. For information about remote access using Dynamic DNS, see 
Dynamic DNS on 
page 89. 
Note:Be sure to change the password for the user name admin to a secure 
password. The ideal password contains no dictionary words from any 
language and contains uppercase and lowercase letters, numbers, 
and symbols. It can be up to 30 characters. See 
Change the admin 
Password on page 75.
To set up remote management:
1. Launch an Internet 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. 
						

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4. Select  ADVANCED > Advanced Setup > Remote Management. 
5. Select the  Turn Remote Management On check box.
6.  In the 
Allow Remote Access By section, specify the external IP addresses to be allowed to 
access the modem router’s  remote management:
Note: For enhanced security, restrict access to as few external IP addresses 
as practical
Select one of the following:
• T
o allow access from a single IP address on the Internet, select the  Only This 
Computer radio button. Enter the IP address to be allowed access. 
• T
o allow access from a range of IP addresses on the Internet, select the \
IP Address 
Range radio button. Enter a beginning and ending IP address to define the all\
owed 
range. 
• T
o allow access from any IP address on the Internet, select the Everyone radio 
button. 
7.  Specify the port number for accessing the web management interface.
Normal web browser access uses the standard HTTP service port 80. For gr\
eater 
security
 , enter a custom port number for the remote web management interface. Ch\
oose 
a number from 1024 to 65535, but do not use the number of any common ser\
vice 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 an Internet browser on a computer that is not on your home networ\
k.
2.  T
ype your modem 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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9
9.   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 you have a server in your home network, you can allow certain types o\
f 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 modem 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 modem router forwards all other incoming protoco\
ls.
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.
The server computer must always have the same IP address. To specify this setting, use  the reserved IP address feature. See Reserve LAN IP Addresses on page  63.
3.  Launch an Internet browser from a computer or wireless device that is co\
nnected to the 
network.
4.  T
ype  http://www.routerlogin.net  or http://www.routerlogin.com .
A login screen displays.
5.  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.
6.  Select  ADV
 ANCED > Advanced Setup > Port Forwarding/Port Triggering.
7. Leave the  Port Forwarding radio button selected as the service type.
8.  In the Service Name list, select the service name. 
						

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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  95.
9.  In the Server IP 
 Address field, enter the IP address of the computer that will provide th\
e 
service. 
10.  Click the  Add button.
The service displays in the list.
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 an Internet browser from a computer or wireless device that is co\
nnected 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.
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 Service T
 ype field, select the protocol. If you are unsure, select  TCP/UDP.
10.  In the External Starting Port field, enter the beginning port number
 .  
						

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96 Nighthawk AC1900 WiFi Cable Modem Router 
If the application uses a single port, enter the same port number in the 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.
11. Specify the internal ports by one of these methods:
•Leave the Use the same port range for Internal port check box selected.
•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 an Internet 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.
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.
•For the internal ports, leave the Use the same port range for Internal port check 
box selected.
•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. 
						

							Specify Internet Port Settings 
97  Nighthawk AC1900 WiFi Cable Modem Router
9. Click the Apply button.
Your changes are saved.
Delete a Port Forwarding Entry
To delete a port forwarding entry:
1. Launch an Internet 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.
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. 
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. 
						

							Specify Internet Port Settings 
98 Nighthawk AC1900 WiFi Cable Modem Router 
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 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 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 64. 
						

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 Nighthawk AC1900
 WiFi Cable Modem  Router
Add a Port Triggering Service
To add a port triggering service:
1. Launch an Internet browser from a computer or wireless device that is co\
nnected 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.
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. 
5.  Select the Port T
 riggering radio button.
6.  Click the  Add Service button.
7. In the Service Name field, type a descriptive service name. 
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 T
riggering 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 T
 ype, Starting Port, and 
Ending Port  fields.
12.  Click the  Apply button. 
						

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100 Nighthawk AC1900 WiFi Cable Modem Router 
The service is now in the Portmap table. You must enable port triggering before the 
modem router used port triggering for the service that you added. See the following 
section.
Application Example: Port Triggering for Internet Relay Chat 
Some application servers, such as FTP and IRC servers, send replies to multiple port 
numbers. Using port triggering, you can tell the modem router to open more incoming 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 modem router, “When you initiate a session with destination port 6667, you must also 
allow incoming traffic on port 113 to reach the originating computer.” The following sequence 
shows the effects of the port triggering rule you have defined:
1. You open an IRC client program to start a chat session on your computer. 
2. Your IRC client composes a request message to an IRC server using a destination port 
number of 6667, the standard port number for an IRC server process. Your computer then 
sends this request message to your modem router.
3. Your modem router creates an entry in its internal session table describing this 
communication session between your computer and the IRC server. Your modem 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 number of 6667, your 
modem router creates another session entry to send any incoming port 113 traffic to your 
computer.
5. The IRC server sends a return message to your modem router using the NAT-assigned 
source port (for example, port 33333) as the destination port. The IRC server also sends an 
“identify” message to your modem router with destination port 113.
6. When your modem 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 modem router restores the original address information replaced by NAT and 
sends this reply message to your computer.
7. When your modem 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 
modem 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 modem router eventually senses a period of 
inactivity in the communications. The modem router then removes the session information 
from its session table, and incoming traffic is no longer accepted on port numbers 33333 or 
113.