Is Cable modem registering? - IE are all the lights lit on the cable modem? Recieve, Send, Online.
Check receive light - if solid check: If not click here: InformationSend light - if solid check: If it is not click here: Send light Information
Online light - if solid check: If it is not click here: Online light Information
The 1 way cable modems should have a Downstream Power Level (dB) of between -15dB and +15dB The SNR should be above 25.0
The upstream is handeled by the dialup modem, built into the cable modem.
Check the Ip address on the computer / router:
Private ip address: will be in the range: 192.168.100.X - but only if computer plugged directly into the cable modem! If plugged into a router the computer may have an ip like 192.168.1.x or 10.0.0.X etc
Public ip address should be in the range:
One Way: 209.77.201.x
Two Way Gualala: 63.199.80.x
Two way The Sea Ranch: 64.160.187.x
or check conflicts on router:
Instructions troubleshooting router conflicts.
Regular troubleshooting for a broadband connection after this point.