I think modem problems.

[Doug]

My router is a level one WBR-6011:  http://global.level1.com/Wireless/WBR-6011/p-835.htm
My modem is Cisco 2100:  http://www.cisco.com/web/consumer/support/modem_DPC2100.html#~userguides

When I run the modem straight to the desktop I have internet.  When I add the router, I lose my internet to the desktop computer which is wired.  The router works fine when it's connected, the problem is there's no internet.  Again, with no router I have internet, with the router, no internet.

[Computer_Commando]

I assume for both configurations you are using the ethernet port on the modem & not the USB port?

[Doug]

Yes, I'm using the ethernet port on the modem. 

[Computer_Commando]

1.  Bad cable from router to modem.
2.  WAN port on router is dead.

I assume the yellow port (WAN) on the router is the one you are connecting to the modem?

[Doug]

I started this thread the last time I had a problem with the router which was the 13th, one week ago.  Since that time the router has worked fine.  But last night it happened again.  I didn't call the cable company but ran my modem straight to my desktop and the internet worked.  I tried re-powering the modem and router in all different orders and combinations many times without results.  Now, 12 hours later, I turned everything on and it's all working fine now with the router connected.  On one occasion when I was on the phone with the cable company, they said something about the network not seeing my router. 

This is a crazy intermittent problem happening at about once a week.  Any thoughts?  If I buy an ethernet y-cable and run that from the modem-one to my desktop, one to the router, would that do anything?  I add that because when I bypass the router I get internet.

[Computer_Commando]

I assume the yellow port (WAN) on the router is the one you are connecting to the modem?

[Doug]

I assume the yellow port (WAN) on the router is the one you are connecting to the modem?

Yes. 

[Doug]

Do you have any other suggestions besides the cables being plugged in wrong? 

[Computer_Commando]

Seems like something is wrong with the router.