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The TFTP Protocol (Revision 2) (RFC1350) Disclosure Number: IPCOM000002174D
Original Publication Date: 1992-Jul-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 9 page(s) / 23K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

K. Sollins: AUTHOR


Status of this Memo

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 13% of the total text.

Network Working Group K. Sollins

Request For Comments: 1350 MIT

STD: 33 July 1992

Obsoletes: RFC 783


Status of this Memo

This RFC specifies an IAB standards track protocol for the Internet

community, and requests discussion and suggestions for improvements.

Please refer to the current edition of the "IAB Official Protocol

Standards" for the standardization state and status of this protocol.

Distribution of this memo is unlimited.


TFTP is a very simple protocol used to transfer files. It is from

this that its name comes, Trivial File Transfer Protocol or TFTP.

Each nonterminal packet is acknowledged separately. This document

describes the protocol and its types of packets. The document also

explains the reasons behind some of the design decisions.


The protocol was originally designed by Noel Chiappa, and was

redesigned by him, Bob Baldwin and Dave Clark, with comments from

Steve Szymanski. The current revision of the document includes

modifications stemming from discussions with and suggestions from

Larry Allen, Noel Chiappa, Dave Clark, Geoff Cooper, Mike Greenwald,

Liza Martin, David Reed, Craig Milo Rogers (of USC-ISI), Kathy

Yellick, and the author. The acknowledgement and retransmission

scheme was inspired by TCP, and the error mechanism was suggested by

PARC's EFTP abort message.

The May, 1992 revision to fix the "Sorcerer's Apprentice" protocol

bug [4] and other minor document problems was done by Noel Chiappa.

This research was supported by the Advanced Research Projects Agency

of the Department of Defense and was monitored by the Office of Naval

Research under contract number N00014-75-C-0661.

1. Purpose

TFTP is a simple protocol to transfer files, and therefore was named

the Trivial File Transfer Protocol or TFTP. It has been implemented

on top of the Internet User Datagram protocol (UDP or Datagram) [2]

so it may be used to move files between machines on different

networks implementing UDP. (This should not exclude the possibility

of implementing TFTP on top of other datagram protocols.) It is

designed to be small and easy to implement. Therefore, it lacks most

of the features of a regular FTP. The only thing it can do is read

and write files (or mail) from/to a remote server. It cannot list

directories, and currently has no provisions for user authentication.

In common with other Internet protocols, it passes 8 bit bytes of


Three modes of transfer are currently supported: netascii (This is

ascii as defined in "USA Standard Code for Information Interchange"

[1] with the modifications specified in "Telnet Protocol

Specification" [3].) Note that it is 8 bit ascii. The term

"netascii" will be used throughout this document to mean this