[pmtud] RFC 4821 on Packetization Layer Path MTU Discovery

A new Request for Comments is now available in online RFC libraries.

        RFC 4821

        Title:      Packetization Layer Path MTU Discovery 
        Author:     M. Mathis, J. Heffner
        Status:     Standards Track
        Date:       March 2007
        Mailbox:    mathis@psc.edu, 
                    jheffner@psc.edu
        Pages:      32
        Characters: 75665
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-pmtud-method-11.txt

        URL:        http://www.rfc-editor.org/rfc/rfc4821.txt

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.  
[STANDARDS TRACK]

This document is a product of the Path MTU Discovery
Working Group of the IETF.

This is now a Proposed Standard Protocol.

STANDARDS TRACK: This document specifies an Internet standards track
protocol for the Internet community,and requests discussion and 
suggestions for improvements.Please refer to the current edition of the 
Internet Official Protocol Standards (STD 1) for the standardization 
state and status of this protocol.  Distribution of this memo is 
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