TCP Maintenance and Minor Extensions (tcpm) ------------------------------------------- Charter Last Modified: 2009-10-13 Current Status: Active Working Group Chair(s): Wesley Eddy David Borman Transport Area Director(s): Magnus Westerlund Lars Eggert Transport Area Advisor: Lars Eggert Mailing Lists: General Discussion:tcpm@ietf.org To Subscribe: https://www.ietf.org/mailman/listinfo/tcpm Archive: http://www.ietf.org/mail-archive/web/tcpm/index.html Description of Working Group: TCP is currently the Internet's predominant transport protocol. To maintain TCP's utility the IETF has regularly updated both the protocol itself and the congestion control algorithms implemented by the protocol that are crucial for the stability of the Internet. These changes reflect our evolving understanding of transport protocols, congestion control and new needs presented by an ever-changing network. The TCPM WG will provide a venue within the IETF to work on these issues. The WG will serve several purposes: * The WG will mostly focus on maintenance issues (e.g., bug fixes) and modest changes to the protocol and algorithms that maintain TCP's utility. * The WG will be a venue for moving current TCP specifications along the standards track (as community energy is available for such efforts). * The WG will write a document that outlines "what is TCP". This document will be a roadmap of sorts to the various TCP specifications in the RFC series. TCPM will take a subset of the work which has been conducted in the Transport Area WG over the past several years. Specifically, some of the WG's initial work will be moved from the Transport Area WG (tsvwg). TCPM is expected to be the working group within the IETF to handle TCP changes. Proposals for additional TCP work items should be brought up within the working group. While fundamental changes to TCP or its congestion control algorithms (e.g., departure from loss-based congestion control) should be brought through TCPM, it is expected that such large changes will ultimately be handled by the Transport Area WG (tsvwg). All additional work items for TCPM will, naturally, require the approval of the Transport Services Area Area Directors and the IESG. TCP's congestion control algorithms are the model followed by alternate transports (e.g., SCTP and (in some cases) DCCP). In addition, the IETF has recently worked on several documents about algorithms that are specified for multiple protocols (e.g., TCP and SCTP) in the same document. Which WG shepherds such documents in the future will determined on a case-by-case basis. In any case, the TCPM WG will remain in close contact with other relevant WGs working on these protocols to ensure openness and stringent review from all angles. Specific Goals: * A document specifying a way to share the local "User TimeOut" value with the peer such that TCP connections can withstand long periods of disconnection. * The WG is coming to grips with how to deal with spoofed segments that can tear down connections, cause data corruption or performance problems. To this end the WG is generating an overview document as well as a scheme that mitigates some of the issues brought on by spoofed TCP segments using a challenge-response scheme to reduce the probabilities of a connection being impacted. Finally, the WG will produce a document outlining the potential impact of using ICMP messages to attack TCP streams. * The WG is writing an informational document about the ways in which TCPs can handle ICMP "soft errors". * The WG is updating the specification for Explicit Congestion Notification to allow for the use of ECN during part of TCP's three-way handshake to aid performance for short transfers. * The WG is writing an informational document that discusses commonly used, but not documented ways to combat SYN flooding attacks. * The WG is updating RFC 2581 to fix some minor specification problems and move it along the standards track. Goals and Milestones: Done Submit FRTO draft to IESG for publication as an Experimental RFC Done Submit TCP Roadmap document to IESG for publication as a Best Current Practices RFC Done Submit NCR Reordering Mitigation draft to the IESG for publication as an Experimental RFC Done Submit overview of spoofing attacks against TCP to IESG for publication as an Informational RFC Done Submit User TimeOut option document to the IESG for publication as a Proposed Standard RFC Done Submit SYN flooding document to the IESG for publication as an Informational RFC Done Submit soft errors document to the IESG for publication as an Informational RFC Mar 2009 Submit In-Window Attack draft to IESG for publication as a Proposed Standard RFC Done Submit ECN-SYN document to the IESG for publication as a Proposed Standard RFC Done Submit revision of RFC 2581 to the IESG for publication as a Draft Standard Apr 2009 Submit TCP Authentication Option document to the IESG for Proposed Standard RFC Jul 2009 Submit ICMP attack document to the IESG for publication as an Informational RFC Jul 2009 Submit TCP Early-Retransmit document to the IESG for Experimental RFC Jul 2009 Submit update to RFC 1323 to the IESG for Proposed Standard RFC Jul 2009 Submit MSS text revision originally from RFC 1323 appendix to the IESG for Proposed Standard RFC Jan 2010 Submit TCP Urgent Pointer draft to IESG for publication as a Proposed Standard RFC Aug 2010 Submit document on security hardening of TCP implementations to the IESG for publication as a Best Current Practices RFC Oct 2010 Submit document on the use of SACK data to trigger loss recovery to the IESG for Proposed Standard Oct 2010 Submit document on mitigation of 'Long Connectivity Disruptions' to the IESG for Experimental Internet-Drafts: Posted Revised I-D Title ------ ------- -------------------------------------------- Apr 2004 Sep 2009 Improving TCP's Robustness to Blind In-Window Attacks Feb 2006 Aug 2009 ICMP attacks against TCP Nov 2007 Oct 2009 The TCP Authentication Option Aug 2008 Oct 2009 Early Retransmit for TCP and SCTP Mar 2009 Jul 2009 TCP Options and MSS May 2009 Nov 2009 On the implementation of the TCP urgent mechanism Aug 2009 Aug 2009 Security Assessment of the Transmission Control Protocol (TCP) Sep 2009 Oct 2009 Cryptographic Algorithms for TCP's Authentication Option, TCP-AO Oct 2009 Oct 2009 Using TCP Selective Acknowledgement (SACK) Information to Determine Duplicate Acknowledgements for Loss Recovery Initiation Nov 2009 Nov 2009 Making TCP more Robust to Long Connectivity Disruptions (TCP-LCD) Request For Comments: RFC Stat Published Title ------- -- ----------- ------------------------------------ RFC4138 E Aug 2005 Forward RTO-Recovery (F-RTO): An Algorithm for Detecting Spurious Retransmission Timeouts with TCP and the Stream Control Transmission Protocol (SCTP) RFC4653 E Aug 2006 Improving the Robustness of TCP to Non-Congestion Events RFC4614 I Sep 2006 A Roadmap for Transmission Control Protocol (TCP) Specification Documents RFC4953 I Jul 2007 Defending TCP Against Spoofing Attacks RFC4987 I Aug 2007 TCP SYN Flooding Attacks and Common Mitigations RFC5461 I Feb 2009 TCP's Reaction to Soft Errors RFC5482 PS Mar 2009 TCP User Timeout Option RFC5562 E Jun 2009 Adding Explicit Congestion Notification (ECN) Capability to TCP's SYN/ACK Packets RFC5681 DS Sep 2009 TCP Congestion Control RFC5682 PS Sep 2009 Forward RTO-Recovery (F-RTO): An Algorithm for Detecting Spurious Retransmission Timeouts with TCP