My internet speed dropped from aobut 90Mb/s to 0.5-2Mb/s. Only one computer seemed affected.
So I was been looking through the device list on my Linkysys Smart Wi-Fi router and came across something unusual. The same computer is connected three times with different MAC addresses. I tried blocking the MAC addresses that did not match the ipconfig MAC and that resulted each time in the computer being unable to use the internet at all.
I've never seen this before and am dumbfounded. Please help.