This document is obsolete. Please
refer to RFC 2349.
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.
The Trivial File Transfer Protocol  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 .
This document assumes that the reader is familiar with the terminology and notation of both  and .
Timeout Interval Option Specification
The TFTP Read Request or Write Request packet is modified to include the timeout option as follows:
is a Write Request, with the 673312-octet file named "foobar", in binary transfer mode.
In Read Request packets, a size of "0" is specified in the request and the size of the file, in octets, is returned in the OACK. If the file is too large for the client to handle, it may abort the transfer with an Error packet (error code 3). In Write Request packets, the size of the file, in octets, is specified in the request and echoed back in the OACK. If the file is too large for the server to handle, it may abort the transfer with an Error packet (error code 3).
Security issues are not discussed in this memo.
 Sollins, K., "The TFTP Protocol (Revision 2)", STD 33, RFC 1350, MIT, July 1992.
 Malkin, G., and A. Harkin, "TFTP Option Extension", RFC 1782, Xylogics, Inc., Hewlett Packard Co., March 1995.
Malkin & Harkin [Page 3]
RFC 1784 TFTP Options March 1995
Gary Scott Malkin Xylogics, Inc. 53 Third Avenue Burlington, MA 01803
Phone: (617) 272-8140 EMail: firstname.lastname@example.org
Art Harkin Internet Services Project Information Networks Division 19420 Homestead Road MS 43LN Cupertino, CA 95014