[pmtud] I-D ACTION:draft-ietf-pmtud-method-08.txt
Internet-Drafts@ietf.org Mon, 14 August 2006 22:57 UTC
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Subject: [pmtud] I-D ACTION:draft-ietf-pmtud-method-08.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Path MTU Discovery Working Group of the IETF. Title : Packetization Layer Path MTU Discovery Author(s) : M. Mathis, J. Heffner Filename : draft-ietf-pmtud-method-08.txt Pages : 35 Date : 2006-8-14 This document describes a robust method for Path MTU Discovery (PMTUD) that relies on TCP or some other Packetization Layer to probe an Internet path with progressively larger packets. This method is described as an extension to RFC 1191 and RFC 1981, which specify ICMP based Path MTU Discovery for IP versions 4 and 6, respectively. The general strategy of the new algorithm is to start with a small MTU and search upward, testing successively larger MTUs by probing with single packets. If a probe is successfully delivered then the MTU can be raised. If the probe is lost, it is treated as an MTU limitation and not as a congestion signal. Packetization Layer PMTUD (PLPMTUD) introduces some flexibility in the implementation of classical Path MTU discovery. IT can be configured to perform just ICMP black hole recovery to increase the robustness of classical Path MTU Discovery, or at the other extreme, all ICMP processing can be disabled and PLPMTUD can completely replace classical Path MTU Discovery. In the latter configuration, PLPMTUD exactly parallels congestion control. An end-to-end transport protocol adjusts properties of the data stream (window size or packet size) while using packet losses to deduce the appropriateness of the adjustments. This technique is more philosophically consistent with the end-to-end principle than relying on ICMP messages containing transcribed headers of multiple protocol layers. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-pmtud-method-08.txt To remove yourself from the I-D Announcement list, send a message to i-d-announce-request@ietf.org with the word unsubscribe in the body of the message. You can also visit https://www1.ietf.org/mailman/listinfo/I-D-announce to change your subscription settings. Internet-Drafts are also available by anonymous FTP. Login with the username "anonymous" and a password of your e-mail address. After logging in, type "cd internet-drafts" and then "get draft-ietf-pmtud-method-08.txt". A list of Internet-Drafts directories can be found in http://www.ietf.org/shadow.html or ftp://ftp.ietf.org/ietf/1shadow-sites.txt Internet-Drafts can also be obtained by e-mail. Send a message to: mailserv@ietf.org. In the body type: "FILE /internet-drafts/draft-ietf-pmtud-method-08.txt". NOTE: The mail server at ietf.org can return the document in MIME-encoded form by using the "mpack" utility. To use this feature, insert the command "ENCODING mime" before the "FILE" command. To decode the response(s), you will need "munpack" or a MIME-compliant mail reader. Different MIME-compliant mail readers exhibit different behavior, especially when dealing with "multipart" MIME messages (i.e. documents which have been split up into multiple messages), so check your local documentation on how to manipulate these messages. Below is the data which will enable a MIME compliant mail reader implementation to automatically retrieve the ASCII version of the Internet-Draft.
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