On Tue, 16 Oct 2018, Michael Thomas wrote:
I believe that the IETF party line these days is that Postel was wrong on this point. Security is one consideration, but there are others.
Postel's Law is about robustness of network communications. As such it can *increase* network security by improving availability [CIA triad] although it could potentially reduce confidentiality and integrity in some circumstances. Whether or not Postel's Law improves or degrades security would need to be assessed on a case by case basis.
Cheers, Rob
