Ethernet connection issues CM1150V

The CM1150v is mostly for having just 1 PC connected or just 1 external wireless router. The additional LAN ports on the 1150v are for static assigned IP addresses from a ISP for mostly a business operation configuration. Or you can connect a LAG compatible router to the CM1150v and use Link Aggregation for bandwdith support. Such as the R7960P which supports LAG on it's WAN side. Again, mostly seen in a business environment. 

If your a home user, I recommend getting into any external router and connect all client devices to the router. Use the 1150v modem for your internet service interface and phone support for you phone support needs. 

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dkrl wrote:

Just purchased modem CM1150V, using OSX, Xfinity internet; in the past with other cable modems, I have always used a direct ethernet connection to my Mac through one ethernet port, and then connected my router from a second ethernet port.  Netgear customer support said that I can not use that setup with this modem--I can either have the direct connection to the computer OR the connection to the router, but not both.  Is this correct?  This is the first time I have ever not been able to have both the computer connected directly by ethernet, and the router connected via  a second port.

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