Requirements for the design of a Substrate Protocol for User Datagrams (SPUD)

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Last updated 2016-11-14 (latest revision 2016-05-10)
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We have identified the potential need for a UDP-based encapsulation protocol to allow explicit cooperation with middleboxes while using new, encrypted transport protocols. This document proposes an initial set of requirements for such a protocol, and discusses tradeoffs to be made in further refining these requirements.


Brian Trammell (
Mirja K├╝hlewind (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)