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TFTP Timeout Interval and Transfer Size Options (RFC1784)

IP.com Disclosure Number: IPCOM000004037D
Original Publication Date: 1995-Mar-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 3 page(s) / 6K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Malkin: AUTHOR [+2]

Abstract

The Trivial File Transfer Protocol [1] is a simple, lock-step, file transfer protocol which allows a client to get or put a file onto a remote host.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 54% of the total text.

Network Working Group G. Malkin

Request for Comments: 1784 Xylogics, Inc.

Updates: 1350 A. Harkin

Category: Standards Track Hewlett Packard Co.

March 1995

TFTP Timeout Interval and Transfer Size Options

Status of this Memo

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 unlimited.

Abstract

The Trivial File Transfer Protocol [1] is a simple, lock-step, file

transfer protocol which allows a client to get or put a file onto a

remote host.

This document describes two TFTP options. The first allows the client

and server to negotiate the Timeout Interval. The second allows the

side receiving the file to determine the ultimate size of the

transfer before it begins. The TFTP Option Extension mechanism is

described in [2].

This document assumes that the reader is familiar with the

terminology and notation of both [1] and [2].

Timeout Interval Option Specification

The TFTP Read Request or Write Request packet is modified to include

the timeout option as follows:

+-------+---~~---+---+---~~---+---+---~~---+---+---~~---+---+

| opc |filename| 0 | mode | 0 | timeout| 0 | #secs | 0 |

+-------+---~~---+---+---~~---+---+---~~---+---+---~~---+---+

opc

The opcode field contains either a 1, for Read Requests, or 2,

for Write Requests, as defined in [1].

filename

The name of the file to be read or written, as defined in [1].

This is a NULL-terminated field.

mode

The mode of the file transfer: "netascii", "octet", or "mail",

as defined in [1]. This is a NULL-terminated field.

timeout

The Timeout Interval option, "timeout" (case insensitive).

This is a NULL-terminated field.

#secs

The number of seconds to wait before retransmitting, specified

in ASCII. Valid values range between "1" and "255" octets,

inclusive. This is a NULL-terminated field.

For example:

+-------+--------+---+--------+---+--------+---+--------+---+

| 1 | foobar | 0 | binary | 0 | timeout| 0 | 1 | 0 |

+-------+--------+---+--------+---+--------+---+--------+---+

is a Read Request, for the file named "foobar", in binary transfer

mode, with a timeout interval of 1 second.

If the server is willing to accept the timeout option, it sends an

Option Acknowledgment (OACK) to the client. The specified timeout

value must match the value specified by the client.

Transfer Size Option Specification

The TFTP Read Request or W...