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Forum Discussion
The mysterious Netgear Nighthawk CM1150V
SERVICE. DEVICES. OPERATING SYSTEM Internet Service: Xfinity 500 Mbps Modem: Netgear Nighthawk Cable Modem with Voice (CM1150V) Laptop 1: Dell Latitude E7440 Laptop 2: Dell Precision 7760 Ca...
This is where the concept of a router comes in to play. If you are trying to connect both of the laptop computers to the internet through the modem at the same time it will not work without a router. Your ISP provides you with one IP address and it is taken by the one computer. Some ISP's will provide you with a second IP address for an additional fee.
While you can connect a computer direct to the internet through the modem, it is not a good long term idea. It exposes your computer direct to the internet without benefit of a firewall to protect it.
You do really need to buy a router. If you do not want to use Wi-Fi, just turn it off.
Your Ethernet ports 2, 3, and 4 have very specialized uses. Like link aggregation and a second IP address if your ISP supports a second one.
Hello, Kitsap. Thanks for your reply.
I am attempting to connect only one laptop computer at a time through the modem. I am not utilizing Ethernet ports 2, 3, and 4. Here's the process:
Xfinity > Netgear CM1150V > Dell Precision 7760. Result: Perfect connection.
Then .....
1. Power down.
2. Unplug the ethernet cable from Dell Precision.
3. Plug the ethernet cable into the Dell Latitude.
4. Power on.
5. Result. "Ethernet doesn't have a valid IP configuration"
By the way, the Precision and Latitude have ESET Internet Security installed. I have experimented with disabling ESET in the Latitude, but that has no effect. The result is the same, whether ESET is enabled or disabled..
Thoughts?
Kitsap is correct. you need a router.
The problem is xfinity. They only assign 1 public ip address per account. (unless you pay extra for more or have a business grade account).
Usually the procedure you followed works. But the problem is, sometimes it takes xfinity a while to reassign that public ip address. Again, its usually minutes but I've seen it take upwards of 30 minutes before during troubleshooting.
Buying a cheap gigabit router and just disabling its wifi (or leave it enabled) would fix your issue as you could connect as many devices as you wanted. You could get a generation or 2 old router off amazon or craigslist/fleabay for pretty cheap and you wouldn't have to fight the issue you're having.
Hello, plemans. Thanks for your reply.
I purchased a Netgear 8-Port Gigabit Ethernet Unmanaged Switch (GS308). My original idea was this configuration:
Xfinity > Netgear CM1150V cable modem > Netgear Ethernet Switch > Dell Precision and Dell LatitudeThat configuration doesn't work and, as I described above, bypassing the GS308 ethernet switch and connecting directly to the Latitude doesn't work either. I'm still not clear about why the Precision connects, but not the Latitude. But, at this point, I just want to get the Latitude connected. (It will serve as a backup).
Could you, please, provide a couple of router recommendations? The most important feature, for me, is a physical, external switch that would allow me to turn off the wireless radios (not just the SSID broadcast), without interrupting my hardwired connection to the internet. I do not want to access router settings via the internet to accomplish this.I'm not concerned about the cost of the router. This is for my work, and it's important to have a reliable, fast and stable connection. My current Xfinity service is 500 Mbps, but I might upgrade the speed at some point.
Thanks again.
FYI, the CM series of modems DO NOT have a built in router.
Xfinity > Netgear CM1150V cable modem > Netgear Ethernet Switch > Dell Precision and Dell Latitude< This will NOT work.
Xfinity > Netgear CM1150V cable modem >External Wifi Router> Netgear Ethernet Switch > Dell Precision and Dell Latitude< Will work.
If you think ESET Internet Security or any other software based protection program is going to provide a level of security when directly connected to the internet, the only person you are fooling is yourself. The design basis for software based computer protection programs is they operate inside a hardware firewall like provided with a router.
Your configuration of a computer connected directly to a cable modem is the basis for botnets, spam generators, and other threats to the internet. Running such a configuration is irresponsible on your part.
Whether it is intentional or not, you are playing with fire and should stop.
