Setting up a Comcast Motorola modem but getting ‘no connectivity’ due to router IP address?
I am trying to set up my Comcast Motorola SB5120 modem. All cables are connected properly, but when I run the install CD it says I have no connectivity. When talking to a Comcast rep, he mentioned my IP address is that of a router (192.168.100.2) although there is currently no router connected to the laptop or modem. I have tried ipconfig/release and ipconfig/renew to no avail – I still have the same router IP address. Is there a way to refresh to a new IP address so that I can get connectivity with my Comcast modem? The last couple of times I have worked with the Comcast rep, they transfer me to a Microsoft customer service rep who is unable to assist me. Thanks so much.
192.168.100.2 is what’s called a non-routable IP address. This means it can’t be used for internet connectivity, since internet routers won’t route them to other routers. So yes, that’s a huge problem if you want to get out to the internet and don’t have a DSL/Cable router handling the IP addresses.
It seems that your computer isn’t picking up an IP address from Comcast. Since this should not be the case, the first thought I’d have is that you are using a static IP address rather than getting one assigned by comcast. This needs to be changed in your network settings. To check this, do the following:
Open control panel (this assumes Vista) and open the Network and Sharing Center control panel
Find the text link that says View Status (it should be to the right, less than halfway down the page)
A new window should open. Find the Properties button and click on it.
Find “Internet Protocol Version 4 (TCP/IPv4)” and double-click on it.
Make sure “Obtain an IP address automatically” is checked.
This is the first thing I would check.
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His modem is in Standby – hit the standby button on top of the Motorola modem and he’ll be fine. When a Motorola modem is in standby it will give you a 192.168.100.x IP, a router IP would be 192.168.1.x
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