DNS and MTU

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kentek

New Around Here
I have 2 AC68U set up as a Mesh. They are connected to my neighbors Internet Frontier router. (Don't ask!)

I attempted to change the MTU to settings between 1440 and 1472. Nothing worked. Could not load anything on Roku and even websites got slow to load or would not load at all. I set it all back to default 1500 and now all working AOK. It is my understanding that a lower MTU will prevent fragmenting of packets. Obviously something going on that I do not understand. ISP demands only 1500 MTU packets? Don't know...
My second issue is what should the DNS privacy protocol be set to and why.
 

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