![]() It uses UDP even without a complete TCP/IP stack implementation the protocol could work, but TCP is not there guaranteeing the packet delivery. This way the fixed 512 bytes block size ruled on the original specification was able to be dynamically "negotiated" to higher values on a per-transfer basis.Ĭonsidering the file transfer itself, the protocol appears being surprisingly simple. Right after RFC-2348 introduced "block-size" as one of the negotiated options using the previously defined framework. The first being RFC-2347 introducing the "option negotiation" framework as a way to dynamically coordinate parameters between requester and provider before a particular transfer begins. Even today very famous companies rely on just concealed HTML URLs for their customer download of sensitive material. ![]() Some people consider TFTP insecure because of this, but taking into account the protocol does not include file listing/removal capabilities either, many other people consider TFTP security is "acceptable" on many scenarios. With simplicity in mind it is not hard to understand why the protocol does not have provisions for user authentication. It is considered by many the simplest file transfer protocol, which is the reason it became the favorite choice for embedded devices or anything with limited hardware resources on the need of sending and/or receiving files. It was initially documented by the Internet Engineering Task Force (IETF) standard RFC-783 (1981) and later on its updated version the RFC-1350 (1992). The TFTP protocol has been with us for quite a long time now.
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