Is it possible to keep a cable modem and also have DSL from another company?
Sure. You have to pay for it, but sure. I had such a setup for awhile. DSL comes over the phone line, so there is no "interference". As long s there is a DSL provider in your area, you can sign up.
In fact, I used to have Comcast at 20MBPS. I switched to Verizon DSL which is advertised at 7MBPS, but always tests at 6MBPS. It is less than half the cost of Comcast. And still, my Netflix streams just fine, I can even have 3 computers connected to the internet and still stream Netflix just fine.
Once you get the DSL, you might find you no longer need the cable modem, and it is usually cheaper. Comcast, in my area, now has something called Xfinity, which claims 80MBPS. That might be useful in the future, but right now, I don't see why anybody would need that type of speed. Even for those of you downloading movies or music, 6MBPS is usually about as fast as you are going to get anyway - since the other party you are downloading from would also have to have an 80MBPS connection to get the benefits of the speed and most users just don't have that capacity.
Just call the DSL provider to make sure they use DYNAMIC IP's. Some are STATIC.
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