Motorola SB5101 Modem

you will need to install the usb drivers that accompanied this motorola modem

I have a similar problem. The common denominator seems to be the SB5101. I have a brand new Belkin Surf 300N, same issue. The modem will not give DHCP to the router. I can connect fine via ethernet to the modem directly.
This modem seems to be a dinosaur.

Please talk to OEM. Modem is faulty either firmware needs to be updated.

I have been experiencing the same problems recently for the past 3 weeks and I had the same modem going on 5 years with no problems so, I replaced it with another exact model still same problems. I have the cable people coming out next week and, I will get back with you with the solution.

If you are able to access the internet this is a normal operating status. These lights are just letting you know there is activity present with the modem and the modem is sending and receiving information with your provider.

If you have the following lights :
Power light - on
Receive light - flashing
Send light - flashing
Online light - off
PC/Activity - on
Standby - off
Then your Network Access is OFF - modem is successfuly registered but Network Access Control is disabled via DOCSIS configuration file.

Call your internet service provider....

You need to input IP and DNS information in windows. I can only help you where to input but you need to contact your ISP for IP address.

You need to disable the UPnP function on the Belkin router. Log into the router(192.168.2.1), and look under System Settings. If you haven't changed the password on the router, the default password is blank, i.e., no password.

If all the lights go out I would assume you mean the power light as well. Couple of things I would look at:

Has your ISP replaced the modem including the power adapter?
Has your ISP verified there is no short on the incoming data cable? You could try to wiggle the incoming data cable to see if the lights go out. I would do the same on the power cable.

If it's not a mechanical fault (cables), verify that you have the correct and current drivers for your modem and operating system.

Good luck and thanks for using FixYa.

Try putting 192.168.100.1 in the address box of a web browser. If the modem is provided by your ISP you might need to call them if that won't work.