TFTP Timeout Interval and Transfer Size Options (RFC2349)

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Malkin: AUTHOR [+2][-]

A. Harkin: AUTHOR

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.

Network Working Group G. Malkin

Request for Commments: 2349 Bay Networks

Updates: 1350 A. Harkin

Obsoletes: 1784 Hewlett Packard Co.

Category: Standards Track May 1998

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.

Copyright Notice

Copyright (C) The Internet Society (1998). All Rights Reserved.

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].

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 in-sensitive).

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" seconds,

inclusive. This is a NULL-terminated field.

For example:

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

| 1 | foobar | 0 | octet | 0 | timeout| 0 | 1 | 0 |

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

is a Read ...