Looking to use 2 modem 2 services from same company on one cable

Jan 17, 2019
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I have 2 modems and 2 services with the same company but only one cable coming out with a splitter connected to go to each modem will these modems be fighting for bandwidth, and will they both have same ip adress, how do that work if so how do I go about seperating the 2
 

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