Also encryption: > The first byte of the clear data was a flags field which, he said, was promptly ossified by a middlebox vendor, leading to packets being dro

Also encryption: > The first byte of the clear data was a flags field which, he said, was promptly ossified by a middlebox vendor, leading to packets being dropped when a new flag was set. [...] > The only defense against ossification of network protocols by middleboxes, he said at the conclusion of the talk, is encryption.