[pilc] Liaison Statement to ITU-R from the IETF Transport Directorate on TCP over Satellite Collaboration
Aaron Falk <falk@isi.edu> Wed, 19 January 2005 19:02 UTC
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From: Aaron Falk <falk@isi.edu>
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Subject: [pilc] Liaison Statement to ITU-R from the IETF Transport Directorate on TCP over Satellite Collaboration
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This is a heads-up since folks on the PILC list may be interested. There may be some discussion on the TCPSAT mail list related to the note below. Coordinates to subscribe to TCPSAT and a pointer to the the letter from ITU-R to the IETF appear at the bottom of the message. --aaron ----- Forwarded message from Aaron Falk <falk@ISI.EDU> ----- From: Aaron Falk <falk@ISI.EDU> To: Valery Timofeev <valery.timofeev@itu.int>, Jinxing Li <jinxing.li@itu.int> Cc: Mark Allman <mallman@icir.org>, Scott Bradner <sob@harvard.edu>, Allison Mankin <mankin@psg.com>, Transport Directorate List <tsv@newdev.harvard.edu> Date: Thu, 13 Jan 2005 17:38:06 -0800 Subject: Liaison Statement to ITU-R from the IETF Transport Directorate on TCP over Satellite Collaboration User-Agent: Mutt/1.4.2.1i Organization: USC ISI Dear Director Timofeev, We were very interested to read your letter of 13 October 2004 [1] informing the IETF of a new Study Group 4 Recommendation on "Performance enhancements of TCP over satellite networks." Beyond the issue of whether the Recommendation may include RFC abstracts (we believe Scott Bradner has already addressed this), we would like to offer some technical feedback on IETF technologies and activities which might be of interest to SG4. First, we should make clear that we believe the list of IETF RFCs included in your letter seems very appropriate to improving TCP performance over satellite. In the spirit of collaboration, offered in your letter, there are several suggestions we would like to make. 1. Several of the RFCs listed have been obsoleted by new work. The table below summarizes the obsoleted RFCs: Obsolete New ======== ======== RFC2414 RFC3390 RFC2481 RFC3168 RFC2582 RFC3782 2. The IETF had a working group on TCP Performance over Satellite (tcpsat) which produced two of the RFCs on SG4's list: RFC2488, "Enhancing TCP Over Satellite Channels using Standard Mechanisms", and RFC2760, "Ongoing TCP Research Related to Satellites." This work was later generalized to encompass any 'disadvantaged' link in another working group, Performance Implications of Link Characteristics (pilc) [2]. The output from the PILC working group will likely also be of interest to SG4: o Advice for Internet Subnetwork Designers (RFC 3819) o Performance Enhancing Proxies (PEPs) Intended to Mitigate Link-Related Degradations (RFC 3135) o End-to-end Performance Implications of Slow Links (RFC 3150) o End-to-end Performance Implications of Links with Errors (RFC 3155) o Advice to link designers on link Automatic Repeat reQuest (ARQ) (RFC 3366) o TCP Performance Implications of Network Path Asymmetry (RFC 3449) 3. As satellite networks tend to be sensitive to efficient use of bandwidth, we recommend reviewing the RFCs and works-in-progress by the IETF working group on Robust Header Compression (rohc) (see [3]). 4. The IETF continues to evolve TCP in the TCP Maintenance and Minor Extensions (tcpm) working group [4]. While the group is concerned with general TCP modifications, some modifications are motivated by specific environments (e.g., wireless networks). The TCPM WG would benefit from the participation and perspective of the members of ITU-R SG4 and we encourage their participation. While the TCPSAT working group is no longer active, the mailing list continues to be maintained with over 1000 subscribers from both the IETF and satellite communities. We would like to offer the TCPSAT mailing list as a forum for additional collaboration between the ITU-R and IETF on this topic. Anyone may subscribe to this list. Instructions for subscribing may be found at [5]. Best Regards, For the IETF Transport Directorate: Aaron Falk <falk@isi.edu> Chair, past TCPSAT and PILC working groups Mark Allman <mallman@icir.org> Chair, TCPM working group Scott Bradner <sob@harvard.edu> IETF liaison to ITU ------------------ [1] http://www.ietf.org/IESG/LIAISON/file58.PDF [2] http://www.ietf.org/html.charters/OLD/pilc-charter.html [3] http://www.ietf.org/html.charters/rohc-charter.html [4] http://www.ietf.org/html.charters/tcpm-charter.html [5] http://mailman.isi.edu/mailman/listinfo/tcpsat ----- End forwarded message ----- _______________________________________________ pilc mailing list pilc@ietf.org https://www1.ietf.org/mailman/listinfo/pilc http://www.ietf.org/html.charters/pilc-charter.html http://pilc.grc.nasa.gov/