Just bought an AC750 Wi-Fi range extender (model RE200).
I followed the quick installation guide, but got no access to the setup page (via an Ethernet cable).
My box complains about a device in a "wrong subnetwork" (RE IP is 192.168.0.254, box is 192.168.1.254) and also about a duplicate DHCP server.
I tried to access it from my PC via it web interface to IP 192.168.0.254: No reply (The Beatles, 1964).
I tried to access it via the given alternate address http://tplinkrepeater.net/ but I got a page with a message: "Looks like something went wrong".
So, I tried to RTFM harder and found this page https://www.tp-link.com/us/support/download/re200/ where I learned that I was supposed to know that the RE has to be connected to the WAN port of my box (how come?)
I connected the RE to the WAN port, same behaviour: none.
Any help strongly and warmly appreciated.
I have to add that the RE actually works perfectly well in a LAN port of my box without doing nothing, I do have my Internet connection via Wi-Fi (the one of the box is turned off) but I'm not comfortable with devices which work fine without any config, you know.