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The MTU flag as you would probably guess sets the MTU of the tunnel, it's default is 1420 or whatever your upstream internet line is set to. but using this command you can lower this (or raise it, but be warned unless your entire path supports jumbo frames this is likely to break your connection on a standard 1500 MTU line). Basically don't touch this unless you have a need to

Example usage is below

MTU = 1392