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|* [http://www.pegsol.com/whitehorn/downloads.htm Whitehorn TFTP Server] free multithreaded TFTP server|
Trivial File Transfer Protocol (TFTP)
TFTP is used to transfer files in a very simple way.
Compared to other file transfer protcols (like: ["FTP"] or ["HTTP"]), TFTP is much simpler (and much smaller in code size) and therefore easier to implement. Because of this, it's often used in embedded devices (e.g. thin clients) to get files from a server at bootup time (typically in conjunction with ["BOOTP"]).
Sometimes TFTP is also used to upload firmware files from the user to an embedded device, but as these devices become more and more advanced, ["HTTP"] is more often used for this purpose today.
XXX - add a brief description of TFTP history
- ["UDP"]: Typically, TFTP uses ["UDP"] as its transport protocol. The well known UDP port for TFTP traffic is 69.
XXX - Add example traffic here (as plain text or Ethereal screenshot).
The TFTP dissector is (fully functional, partially functional, not existing, ... whatever the current state is).
There are no TFTP specific preference settings.
Example capture file
XXX - Add a simple example capture file to the SampleCaptures page and link from here. Keep it short, it's also a good idea to gzip it to make it even smaller, as Ethereal can open gzipped files automatically.
A complete list of TFTP display filter fields can be found in the [http://www.ethereal.com/docs/dfref/t/tftp.html display filter reference]
Show only the TFTP based traffic:
You cannot directly filter TFTP protocols while capturing. However, if you know the ["UDP"] port used (see above), you could filter on that one; however, as a TFTP server will choose a unique port number from which to send the reponse, and will send it to the port number from which the request came, which is not likely to be a well known port number, a filter checking for UDP port 69 will capture only the initial TFTP request, not the response to that request or any subsequent packets in that TFTP conversation.
[http://www.ietf.org/rfc/rfc783.txt RFC 783] THE TFTP PROTOCOL (REVISION 2)