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On 07/11/2016 10:39 AM, Jay Pipes wrote:

> Out of curiosity, in what scenarios is it better to limit the instance's MTU to
> a value lower than that of the maximum path MTU of the infrastructure? In other
> words, if the infrastructure supports jumbo frames, why artificially limit an
> instance's MTU to 1500 if that instance could theoretically communicate with
> other instances in the same infrastructure via a higher MTU?

It is my understanding that using the max path MTU is ideal, but that not all 
software does path MTU discovery.  Also, some badly-designed security devices 
can mess up PMTUD.

Chris