Chapter 5 Troubleshooting

Hardware Problems and Solutions

Problem	Possible Cause(s)	Solution
No LED, console, or other activity.	Router is not plugged into a power source. Circuit power interrupted.	Plug your router into a grounded power outlet and make sure the Power switch is On. Check outlet and circuit fuses or breakers.
Cannot communicate from your router to another device.	Wrong cable Loose connection	Check the Part Number (P/N) on the cable and use the appropriate cable. Secure all connections.
Cannot access a remote network or the Internet.	WAN interface connection is loose. ISP service is down. Gateway between the GT 60 Series router and the ISP is down. Telephone lines are down. Ethernet 10Base2 connection is not terminated properly.	Seat the WAN connection securely. Try again later. Contact your ISP for status. Try again later. Contact your ISP for status. Check for active telephone service on line. Check that the T-connector is correctly terminated.

Problem	Possible Cause(s)	Solution
Cannot find a destination.	Wrong IP address	Configure the correct address.
Cannot read a configuration.	Configuration not loaded in the router.	Download the appropriate configuration file.
User cannot access the router.	User does not have appropriate permission.	Check user's account and assign the required permission.
The router is not receiving data.	RIP is not enabled.	Enable RIP.
	Data-link protocols are not compatible.	Check that the same protocol is configured on the source and destination routers.
	Configuration settings are not compatible.	Verify that the settings are the same for both the source and destination routers.
Cannot access a remote network or the Internet.	Wrong IP address	Correct the IP address for the destination.
	Incorrect network mask address	Correct the network mask address.
	Incorrect default gateway address	Correct the default gateway address.