I would first boot a linux USB image. This will eliminate windows and drivers as being the cause.
If it still does it I would suspect a defective ethernet port.
Note if you have a 2.5g port in your machine there have been all kinds of people having issues lately.
I just ran a ping test to google through the command prompt on my laptop with an ethernet, the original test was done with my desktop on an ethernet. If this doesn't point to a clear solution I will attempt to get linux on a USB and run another test.
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