rfc9853v2.txt		rfc9853.txt
	Internet Engineering Task Force (IETF) H. Tschofenig, Ed.		Internet Engineering Task Force (IETF) H. Tschofenig, Ed.
	Request for Comments: 9853 UniBw M.		Request for Comments: 9853 UniBw M.
	Updates: 9146, 9147 A. Kraus		Updates: 9146, 9147 A. Kraus
	Category: Standards Track		Category: Standards Track
	ISSN: 2070-1721 T. Fossati		ISSN: 2070-1721 T. Fossati
	Linaro		Linaro
	February 2026		March 2026
	Return Routability Check for DTLS 1.2 and 1.3		Return Routability Check for DTLS 1.2 and 1.3
	Abstract		Abstract
	This document specifies a Return Routability Check (RRC) subprotocol		This document specifies a Return Routability Check (RRC) subprotocol
	for use in the context of the Connection ID (CID) construct for the		for use in the context of the Connection ID (CID) construct for the
	Datagram Transport Layer Security (DTLS) protocol versions 1.2 and		Datagram Transport Layer Security (DTLS) protocol versions 1.2 and
	1.3.		1.3.
	skipping to change at line 207 ¶		skipping to change at line 207 ¶
	encrypted using the currently active security context.		encrypted using the currently active security context.
	enum {		enum {
	invalid(0),		invalid(0),
	change_cipher_spec(20),		change_cipher_spec(20),
	alert(21),		alert(21),
	handshake(22),		handshake(22),
	application_data(23),		application_data(23),
	heartbeat(24), /* RFC 6520 */		heartbeat(24), /* RFC 6520 */
	tls12_cid(25), /* RFC 9146, DTLS 1.2 only */		tls12_cid(25), /* RFC 9146, DTLS 1.2 only */
	return_routability_check(TBD2), /* NEW */		return_routability_check(27), /* NEW */
	(255)		(255)
	} ContentType;		} ContentType;
	uint64 Cookie;		uint64 Cookie;
	enum {		enum {
	path_challenge(0),		path_challenge(0),
	path_response(1),		path_response(1),
	path_drop(2),		path_drop(2),
	(255)		(255)
End of changes. 2 change blocks.
	2 lines changed or deleted		2 lines changed or added
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