http://www.rfc-editor.org/rfc/rfc2348.txt
RFC 2348: TFTP Blocksize Option, G. Malkin, A. Harkin1998-05-01T23:00:00-00:00The 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 a TFTP option which allows the client and server to negotiate a blocksize more applicable to the network medium. [STANDARDS-TRACK]