A new Request for Comments is now available in online RFC libraries. RFC 6709 Title: Design Considerations for Protocol Extensions Author: B. Carpenter, B. Aboba, Ed., S. Cheshire Status: Informational Stream: IAB Date: September 2012 Mailbox: brian.e.carpenter@gmail.com, bernard_aboba@hotmail.com, cheshire@apple.com Pages: 42 Characters: 103913 Updates/Obsoletes/SeeAlso: None I-D Tag: draft-iab-extension-recs-17.txt URL: http://www.rfc-editor.org/rfc/rfc6709.txt This document discusses architectural issues related to the extensibility of Internet protocols, with a focus on design considerations. It is intended to assist designers of both base protocols and extensions. Case studies are included. A companion document, RFC 4775 (BCP 125), discusses procedures relating to the extensibility of IETF protocols. This document is a product of the Internet Architecture Board. INFORMATIONAL: This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. This announcement is sent to the IETF-Announce and rfc-dist lists. To subscribe or unsubscribe, see http://www.ietf.org/mailman/listinfo/ietf-announce http://mailman.rfc-editor.org/mailman/listinfo/rfc-dist For searching the RFC series, see http://www.rfc-editor.org/rfcsearch.html. For downloading RFCs, see http://www.rfc-editor.org/rfc.html. Requests for special distribution should be addressed to either the author of the RFC in question, or to rfc-editor@rfc-editor.org. Unless specifically noted otherwise on the RFC itself, all RFCs are for unlimited distribution. The RFC Editor Team Association Management Solutions, LLC