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TFTP Windowsize Option (RFC7440) Disclosure Number: IPCOM000240329D
Original Publication Date: 2015-Jan-01
Included in the Prior Art Database: 2015-Jan-24
Document File: 18 page(s) / 18K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

P. Masotta: AUTHOR


TFTP is virtually unused for Internet transfers today, TFTP is still massively used in network boot/installation scenarios including EFI (Extensible Firmware Interface). TFTP's inherently low transfer rate has been, so far, partially mitigated by the use of the blocksize negotiated extension [RFC2348]. Using this method, the original limitation of 512-byte blocks are, in practice, replaced in Ethernet environments by blocks no larger than 1468 Bytes to avoid IP block fragmentation. This strategy produces insufficient results when transferring big files, for example, the initial ramdisk of Linux distributions or the PE images used in network installations by Microsoft WDS/MDT/SCCM. Considering TFTP looks far from extinction today, this document presents a negotiated extension, under the terms of the "TFTP Option Extension" [RFC2347], that produces TFTP transfer rates comparable to those achieved by modern file transfer protocols.

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Internet Engineering Task Force (IETF)                        P. Masotta Request for Comments: 7440                                         Serva Category: Standards Track                                   January 2015 ISSN: 2070-1721

                          TFTP Windowsize Option


   The "Trivial File Transfer Protocol" (RFC 1350) is a simple,    lockstep, file transfer protocol that allows a client to get or put a    file onto a remote host.  One of its primary uses is in the early    stages of nodes booting from a Local Area Network (LAN).  TFTP has    been used for this application because it is very simple to    implement.  The employment of a lockstep scheme limits throughput    when used on a LAN.

   This document describes a TFTP option that allows the client and    server to negotiate a window size of consecutive blocks to send as an    alternative for replacing the single-block lockstep schema.  The TFTP    option mechanism employed is described in "TFTP Option Extension"    (RFC 2347).

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

 Masotta                      Standards Track                    [Page 1]
 RFC 7440                 TFTP Windowsize Option             January 2015

 Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    ( in effect on the date of    publication of this document.  Please review these documents    carefully, as they describe your rights and restrictions with respect    to this document.  Code Components extracted from this document must    include Simplified BSD License text as described in Section 4.e of    the Trust Legal Provisions and are provided without warranty as    described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................2    2. Conventions Used in This Document ...............................3    3. Windowsize Option Specification .................................3    4. Traffic...