Internet stops working when 2 ethernet connections are plugged into modem/router.

Nov 9, 2018
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I just bought a new modem/router and powerline adapter kit. The modem/router is a Netgear (C6250-100NAS) and the powerline kit is a TP-Link (TL-PA7020v2). The problem I am facing is that everything (both wifi and wired connections) works perfectly until I plug in a second ethernet cable from the powerline adapter into the modem/router then the internet completely stops working and I get pulsing 2.4ghz and 5ghz lights while the LAN light flickers constantly. As soon as I unplug any one of the two ethernets connected, the internet seems to comes back to life almost instantly. It doesn't matter which cable I am using or port I am plugging into, so long as I have 2 in the router from the powerline the internet stops after a couple of seconds. Also I have made sure the powerline adapter does work in my house because I can connect my Xbox One with one of the connections upstairs. If someone could possibly help with this situation that would be greatly appreciated, I bought the powerline adapter specifically to be able use both ports for a gaming console and computer. Thanks!
 
You have done the worst possible thing you can do to a network. You have made a loop. It can take the largest and most powerful network down.

Even consumer equipment lately has implemented to standard solution for this called spanning tree that will block all but 1 link between devices so there is no loop. It appears none of your equipment supports this.

You should be able to plug just 1 cable from the router to the powerline units. The remote powerline unit you can plug in multiple device if you want.