Template:Ref RFC/db/66

RFC	Status	Reference	Notes
6633	Proposed Standard	F. Gont (May 2012). Deprecation of ICMP Source Quench Messages. Internet Engineering Task Force. doi:10.17487/RFC6633. ISSN 2070-1721. RFC 6633.	Updates RFC 792, 1122 and 1812.
6648	Best Current Practice	P. Saint-Andre; D. Crocker; M. Nottingham (June 2012). Deprecating the "X-" Prefix and Similar Constructs in Application Protocols. Internet Engineering Task Force. doi:10.17487/RFC6648. ISSN 2070-1721. RFC 6648.
6666	Informational	N. Hilliard; D. Freedman (August 2012). A Discard Prefix for IPv6. Internet Engineering Task Force. doi:10.17487/RFC6666. ISSN 2070-1721. RFC 6666.
6676	Informational	S. Venaas; R. Parekh; G. Van de Velde; T. Chown; M. Eubanks (August 2012). Multicast Addresses for Documentation. Internet Engineering Task Force. doi:10.17487/RFC6676. ISSN 2070-1721. RFC 6676.
6679	Proposed Standard	M. Westerlund; I. Johansson; C. Perkins; P. O'Hanlon; K. Carlberg (August 2012). Explicit Congestion Notification (ECN) for RTP over UDP. IETF. doi:10.17487/RFC6679. ISSN 2070-1721. RFC 6679.	Updated by RFC 8311.
6691	Obsolete	D. Borman (July 2012). TCP Options and Maximum Segment Size (MSS). Internet Engineering Task Force. doi:10.17487/RFC6691. ISSN 2070-1721. RFC 6691.	Obsoleted by RFC 9293. Updates RFC 879 and 2385.