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Only if you want to use it as a gateway for your internet you do or you will not be able to get online.
Sorry, there was a problem. Please try again later.You would need to connect this router to either (1) directly to cable modem (and use this router as a "Wireless Router" and then let all your Internet-enabled devices (Smart TVs, mobile devices, media streamers, etc.) connect to this router either via Ethernet or wirelessly), or (2) to another wireless router in "Access Point" mode through an Ethernet cable to extend the wireless signal coverage to other Internet-enabled clients, or (3) to another wireless router in "Media Bridge" mode wirelessly (but for this one you would need 2 of these routers). - It all just so depends what you want to achieve.
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