I was having a read about the (best/optimal) value for the MTU (current set is 1500) and among other things I read that a way to find the 'optimal' size would be to perform a sustained ping test, i.e. I can use
ping google.com -f -l <buffer size>
If I try
ping google.com -f -l 1500
I get the message "Packet needs to be fragmented but DF set" and in order to not get that message I have to lower the buffer size to 1472.
So my question is: is this a problem and I should change the setting in my router from 1500 to 1472 or I can just ignore it...