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I have an Arris SB8200 and if I wire my Xbox directly to my modem my router stops receiving internet so I cannot get wifi. I've done a reset and unplugged everything in every combination i can. When I get my router to work as soon as I turn on my Xbox my router disconnects and I have to reboot everything. I cannot get both to work at the same time while connected to the modem. Does anyone have ideas or solutions? I just would prefer to have my Xbox wired to my modem rather than through my router if possible. It does work if I hook it up through the router my connection just isn't as good.

Most ISP’s only support 1 public ip address. Meaning only 1 device can be connected to the modem. Even if it has more than 1 ethernet port. 

That’s why you’re having issues there. 

If its not streaming through the router as well, time to make some changes in the router or upgrade routers.