Connect Modem to Wireless Router/Modem Combo!

August 23, 2011 at 18:31:00
Specs: Windows 7
My Motorola SBG901 Modem/Router combo has stopped connecting to the internet. I have done all the troubleshooting with Comcast and with Motorola and it is out of warranty, so I will have to purchase a new one.

In the mean time, I wanted to use it only as a wireless router connected to my Scientific Atlanta DPC2100R2 modem. Is there anyway to do this? Is there a way to disable the modem in the SBG901?

Simply connecting with the ethernet cords has not worked. I connected the DPC2100 to the SBG901 via ethernet cord. My computer was able to pick up a wireless connection but there is no cable connection.

Thanks!


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#1
August 24, 2011 at 07:29:11
In the mean time, I wanted to use it only as a wireless router connected to my Scientific Atlanta DPC2100R2 modem. Is there anyway to do this? Is there a way to disable the modem in the SBG901?

I'm sorry to say, I really doubt you'll be able to make it work. I suspect you'll end up purchasing another SOHO Router.

The reason I say this is, the connection from modem to router always goes into the WAN port on the router and is an RJ-45 connector. In the case of a combo unit, the "in" connector will either be a coax connector for cable broadband, or an RJ-11 (telephone) connector for ADSL.

Your replacement modem will have one "in" connectory of either RJ-11 or coax and the "out" connector will be RJ-45 for a network cable.

Since the router is doing NAT, which allows multiple computers to connect to the internet through a single IP address, and you have to plug into the WAN port (modem to WAN) in order to be able to use NAT, your combo unit leaves you unable to connect that way.

The only way it would work is if your combo unit has a WAN (RJ-45) port as well as the broadband "in" connector.

If it doesn't, you'll need to get a new router that's not a combo unit. You could still use the combo unit once you have another router by connecting it to the new router "LAN port to LAN port" and configuring it to be in the same subnet as the LAN side of the new router. For details on how to do that, click on my name above in this response and read my “how-to” guide titled, “Add a second Router to your LAN

This way, you could buy a non-wireless router and connect your combo unit to the new router and use it as a wireless access point.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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