TFTP

Trivial File Transfer Protocol (TFTP) is a simple clear-text protocol thatallows a client to get a file from or put a file onto a remote host.

Primary use cases for this protocol have been to get the boot image over alocal network. TFTP also stands out a little next to many other protocols bythe fact that it is done over UDP as opposed to TCP which most other protocolsuse.

There is no secure version or flavor of TFTP.

Download

Download a file from the TFTP server of choice:

curl -O tftp://localserver/file.boot

Upload

Upload a file to the TFTP server of choice:

curl -T file.boot tftp://localserver/

TFTP options

The TFTP protocols transmits data to the other end of the communication using"blocks". When a TFTP transfer is setup, both parties either agree on usingthe default block size of 512 bytes or negotiate a different one. curlsupports block sizes between 8 to 65464 bytes.

You ask curl to use a different size than the default with--tftp-blksize. Ask for 8192 bytes blocks like this:

curl --tftp-blksize 8192 tftp://localserver/file

It has been shown that there are server implementations that do not handle optionnegotiation at all, so curl also has the ability to completely switch off allattempts of setting options. If you are in the unfortunate of working withsuch a server, use the flag like this:

curl --tftp-no-options tftp://localserver/file