Netgear C6220 Docsis 3 0 High Speed Wifi Cable Modem Router User Manual

							Specify Internet Port Settings 91
 AC1200 WiFi Cable Modem Router Model C6220
Add a Port Triggering Service
To add a port triggering service:
1. 
Launch a web browser from a WiFi-enabled computer or mobile device that \
is 
connected to the network.
2.  T
ype  http://routerlogin.net  or http://192.168.0.1.
A login window opens.
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 page displays.
4.  Select  ADV
 ANCED > Advanced Setup > Port Forwarding/Port Triggering. 
The Port Forwarding/Port Triggering page displays.
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.  
						

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92 AC1200 WiFi Cable Modem Router Model C6220 
8. In the Service User menu, 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. 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. In the Connection Type, Starting Port, and Ending Port fields, enter the inbound port.
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 92.
Specify When to Use Port Triggering
To specify when to use port triggering: 
1. Launch a web browser from a WiFi-enabled computer or mobile device that is 
connected to the network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login window opens.
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 page displays.
4. Select ADVANCED > Advanced Setup > Port Forwarding/Port Triggering.
The Port Forwarding/Port Triggering page displays. 
						

							Specify Internet Port Settings 93
 AC1200 WiFi Cable Modem Router Model C6220
5. 
Select the Port Triggering  radio button.
6. Select a radio button to specify when you want to use port triggering:
• Never . 
The modem router does not use port triggering even if you specified port\
 
triggering settings.
• Always . 
 Always use port triggering.
7.  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 modem \
router detects  no activity
 . This value is required because the modem router cannot detect when the 
application terminates.
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 modem router to open mo\
re 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 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  modem router.
3.  Y
our  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.  
						

							Specify Internet Port Settings 
94 AC1200 WiFi Cable Modem Router Model C6220 
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 a 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. 
						

							95
9
9.   Troubleshooting
This chapter gives information about troubleshooting your modem router. 
The chapter includes the following sections:
•Use LEDs to Troubleshoot 
•Cannot Log In to the Modem Router 
•Troubleshoot the ISP Connection 
•Troubleshoot a TCP/IP Network Using a Ping Utility 
Tip:NETGEAR provides helpful articles, documentation, and the latest 
software updates at 
support.netgear.com. 
						

							Troubleshooting 96
AC1200 WiFi Cable Modem Router Model C6220 
Use LEDs to Troubleshoot
The following table provides help when using the LEDs for troubleshootin\
g.
Table 3.  LED troubleshooting
LED BehaviorAction
All LEDs are off when the modem  router is plugged in. • 
Make sure that the power cord is properly connected to your 
modem router and that the power adapter is properly connected to 
a functioning power outlet. 
•  Check to see that you are using the 12 VDC power adapter from 
NETGEAR for this product.
•  If the error persists, a hardware problem is occurring. Contact 
technical support.
Only the Power LED is lit • This is normal if the LED On/Of
 f switch is Off or LED Control page 
setting is disabled.
•  Change the LED On/Of
 f switch to On or on the LED Control page, 
select Enable to turn on the other LEDs.
All LEDs stay lit. • Clear the configuration of the modem router to its factory defaults. 
This operation sets the IP address of the modem router to  192.168.0.1. See  Factory Default Settings on page  101. 
•  If the error persists, there is a hardware problem. Contact technical 
support.
LAN LED is off for a port with an 
Ethernet connection. • 
Make sure that the Ethernet cable connections are secure at the 
modem router and at the hub or computer

.
•  Make sure that power is turned on to the connected hub or 
computer

.
•  Be sure that you are using the correct cable.
Internet LED is off and the modem 
router is connected to the cable 
television cable. • 
Make sure that the coaxial cable connections are secure at the 
modem router and at the wall jack.
•  Make sure that your cable service provider provisioned your cable 
Internet service. 

Your provider can verify that the signal quality is 
good enough for modem router service.
•  Remove any excessive splitters from your cable line. Run the cable 
back to the point where the cable enters your home.
Cannot Log In to the Modem Router
If you cannot access the modem router from a computer on your local netw\
ork, check the 
following:
• If you are using a WiFi connection, check to make sure that your compute\
r or mobile 
device is connected to the correct WiFi network.
• If your computer is connected to the modem router wtih an Ethernet cable\
, check the 
connection. 
						

							Troubleshooting 
97  AC1200 WiFi Cable Modem Router Model C6220
•Make sure that your computer’s IP address is on the same subnet as the modem router. 
If you are using the recommended addressing scheme, the address of your computer is 
in the range of 192.168.0.02 to 192.168.0.254. 
Note:If the IP address of your computer is shown as 169.254.x.x: 
Recent versions of Windows and Mac OS generate and assign an IP 
address when the computer cannot reach a DHCP server. These 
autogenerated addresses are in the range of 169.254.x.x. If your IP 
address is in this range, check the connection from the computer to 
the modem router and reboot your computer.
•If the IP address of your modem router changed and you do not know its current IP 
address, clear the configuration of the modem router to its factory defaults. This sets the 
IP address of the modem router to 192.168.0.1. For more information, see 
Factory 
Default Settings on page 101.
•Make sure Java, JavaScript, or ActiveX is enabled on your browser. If you are using 
Internet Explorer, click the Refresh button to make sure that the Java applet is loaded.
•Try quitting the browser and launching it again.
•Make sure that you are using the correct login information. The modem router user name 
admin is lowercase (Caps Lock is off). The default password is password. 
If the modem router does not save changes that you made, do the following:
•When entering settings, make sure to click the Apply button before moving to another 
page, or your changes are lost. 
•Click the Refresh or Reload button in the web browser. The changes might be saved, but 
the web browser might be caching the old configuration.
Troubleshoot the ISP Connection
When your modem router cannot access the Internet and your Internet LED is on, register 
the cable MAC address or device MAC address of your modem router with your cable service 
provider. 
Additionally, the modem router might not be specified as the TCP/IP gateway for your 
computer. If your computer obtains its information from the modem router by DHCP, reboot 
the computer and verify the gateway address.
Troubleshoot a TCP/IP Network Using a Ping Utility
Most TCP/IP terminal devices and routers contain a ping utility that sends an echo request 
packet to the designated device. The device then responds with an echo reply. You can 
easily troubleshoot a TCP/IP network by using the ping utility in your computer or 
workstation. 
						

							Troubleshooting 
98 AC1200 WiFi Cable Modem Router Model C6220 
Use PIng to Test the LAN Path to Your Gateway
You can use ping to verify that the LAN path to your modem router is set up correctly.
To ping the modem router from a computer:
1. From the Windows toolbar, click the Start button and select Run.
2. In the field that is provided, type ping and then the IP address of the modem router, as in 
this example:
ping 192.168.0.1
3. Click OK.
You see a message like the following:
Pinging  with 32 bytes of data
If the path is working, you see this message:
Reply from < IP address >: bytes=32 time=NN ms TTL=xxx
If the path is not working, you see this message:
Request timed out
If the path is not working correctly, you might be experiencing one of the following 
problems:
•Wrong physical connections.
-Make sure that the LAN LED is lit. For more information, see Use LEDs to 
Troubleshoot on page 96.
-Make sure that the corresponding link LEDs are on for your network interface card 
and the hub ports (if any) that are connected to your workstation and modem 
router.
•Wrong network configuration.
-Verify that the Ethernet card driver software and TCP/IP software are both 
installed and configured on your computer or workstation.
-Verify that the IP address for your modem router and your workstation are correct 
and that the addresses are on the same subnet.
Use Ping to Test the Path From a Windows Computer to a 
Remote Device
After verifying that the LAN path works correctly, test the path from the Windows computer to 
a remote device. 
To test the path from a Windows PC to a remote device:
1. From the Windows toolbar, click the Start button and select Run. 
						

							Troubleshooting 
99  AC1200 WiFi Cable Modem Router Model C6220
2. In the field that is provided, type ping and then the IP address of the remote device such as 
the DNS server of your ISP.
If the path is working, you see this message:
Reply from < IP address >: bytes=32 time=NN ms TTL=xxx
3. If you do not receive this reply, do the following:
•Make sure that the Internet LED is lit.
•If your ISP assigned a host name to your computer, enter that host name as the 
account name on the Internet Setup page.
•Make sure that the IP address of your modem router is listed on your computer as the 
default gateway. If DHCP assigns the IP configuration of your computer, this 
information is not visible in the Network Control Panel of your computer. Verify that 
the IP address of the modem router is listed as the default gateway. 
•Make sure that the network address of your computer (the portion of the IP address 
specified by the netmask) is different from the network address of the remote device. 
						

							100
A
A.   Supplemental Information
This appendix includes the following sections.
•Factory Default Settings 
•Technical Specifications