TCP Friendly Rate Control (TFRC): Protocol Specification RFC3448bis

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Presentation transcript:

TCP Friendly Rate Control (TFRC): Protocol Specification RFC3448bis draft-ietf-dccp-rfc3448bis-01.txt S. Floyd, M. Handley, J. Padhye, and J. Widmer, March 2007, DCCP Working Group Slides: http://www.icir.org/floyd/talks.html

Changes from RFC 3448 reported last IETF: Incorporated changes in the RFC 3448 errata. Incorporated the larger initial windows specified in RFC 3390. Clarified how the average loss interval is calculated when the receiver has not yet seen eight loss intervals. Added more about estimating the average segment size.

Changes in draft-ietf-dccp-rfc3448bis-01.txt (reported last IETF): Specified the receiver's initialization of the feedback timer when the first data packet doesn't have an estimate of the RTT. From feedback from Dado Colussi. Added the procedure for sending receiver feedback packets when a coarse-grained timestamp is used. From RFC 4243.

Changes in draft-ietf-dccp-rfc3448bis-01.txt not reported last IETF: Initializing loss history when first packet is lost or ECN-marked (Dado Colussi). General clarifications and expanded discussions. A number of open issues are listed. These are no longer open issues in draft-ietf-dccp-rfc3448bis-02a.txt, available from http://www.icir.org/tfrc/.

Changes in draft-ietf-dccp-rfc3448bis-02b.txt: Caveat: dated March 16. Addition of optional "Limited Receive Rate” variable in feedback packets. Clarified the accumulation of `credits’ during idle periods. Changed threshold DF in Section 5.5 (History Discounting) from 0.5 to 0.25. Several other clarifications. Section 9 lists all changes since RFC 3448. Feedback would be appreciated!

People who have given feedback: Dado Colussi, Gorry Fairhurst, Ladan Gharai, Guillaume Jourjon, Eddie Kohler, Gerrit Renker, Arjuna Sathiaseelan, and others. Many thanks!

Things that *could* be done: Reread RFC 4342 (CCID 3) and RFC 4342 Errata to make sure again that everything is included that should be. Reread research papers on TFRC to see if their recommended changes or observations should be mentioned (“http://www.icir.org/tfrc/”).