User's Manual

66xx/67xx Router Users Guide 172
The DSL LED is Always Off
Make sure you have DSL service. You should receive notification from your ISP that DSL service
is installed. You can usually tell if the service is installed by listening to the phone line: you will
hear some high-pitched noise. If you do not hear high-pitched noise, contact your ISP.
Check to make sure the DSL cable is connected properly.
The Internet LED is Always Off
If the router is set to router mode (i.e. IPoE or IPoE or PPPoA), and the Internet LED is off, check
the modem configuration.
View the Router Summary page and see if the router is configured properly. Check the WAN
Status to make sure the link is up and the router is able to get a WAN IP address from the
network.
The Internet LED is Red
The gateway is set to routed mode but it is not able to connect to the DHCP or PPPoE:
If a wrong username/password was set in the PPP credential, user will see an error screen
instructing them of wrong password and they can re-enter the correct username/password
combination.
If the Internet LED continues to stay red, contact the ISP.
Diagnosing Problems using IP Utilities
Ping
Ping is a command you can use to check whether your PC can recognize other computers on
your network and the Internet. A ping command sends a message to the computer you specify. If
the computer receives the message, it sends messages in reply. To use it, you must know the IP
address of the computer with which you are trying to communicate.
On Windows-based computers, you can execute a ping command from the Start menu.
1. Click the Start button, and then click Run. In the Open text box, type a statement such as
the following:
ping 192.168.1.1 or the IP address you have changed
2. Click OK. You can substitute any private IP address on your LAN or a public IP address for
an Internet site, if known.
If the target computer receives the message, a Command Prompt window is displayed: