5: Transport Evolution: The Encrypted Stack

The transport protocol stack is evolving as a direct result of the increased application of strong cryptography at the transport layer. This is a natural evolution as a way to add back visibility into the header of packets when that visibility is removed at the transport layer. There has long been measurement and operation management protocol development work integrated into the protocol stack, and in many cases, this is intended for test environments or to be enabled for troubleshooting purposes. This is an important consideration as the work to encrypt privacy revealing information at the transport layer should not be added back at another layer. A balance has to be reached to allow for privacy to be maintained and networks to be well managed. In other words, I don't think we will ever achieve the stark contrast of the chapter quote. Security and some network management functions will move back to the edge, but some capabilities for troubleshooting on the wire and maintaining networks will remain.