Search RFCs Advanced Search RFC Editor RFC 3168 The Addition of Explicit Congestion Notification (ECN) to IP, September 2001 File formats: Status:PROPOSED STANDARD Obsoletes:RFC 2481 Updates:RFC 2003, RFC 2474, RFC 2401, RFC 793 Updated by:RFC 4301, RFC 6040, RFC 8311 Authors:K. RamakrishnanS. FloydD. Black Stream:IETF Source:tsvwg (wit) Cite this RFC: TXT | XML | BibTeX DOI: https://doi.org/10.17487/RFC3168 Discuss this RFC: Send questions or comments to the mailing list tsvwg@ietf.org Other actions: View Errata | Submit Errata | Find IPR Disclosures from the IETF | View History of RFC 3168 Abstract This memo specifies the incorporation of ECN (Explicit Congestion Notification) to TCP and IP, including ECN's use of two bits in the IP header. [STANDARDS-TRACK] For the definition of Status, see RFC 2026. For the definition of Stream, see RFC 8729. Document RetrievalErrataFrequently Asked QuestionsFuture Format FAQHistoryAbout UsOther InformationPublication ProcessPublication QueueStyle Guide Advanced Search