gistfile1.txt

RFC 2347 OPTION NEGOTIATION
       This  version  of  tftpd  supports RFC 2347 option negotiation.  Currently
       implemented options are:

       blksize (RFC 2348)
              Set the transfer block size to anything less than or equal  to  the
              specified option.  This version of tftpd can support any block size
              up to the theoretical maximum of 65464 bytes.

       blksize2 (nonstandard)
              Set the transfer block size to anything less than or equal  to  the
              specified  option, but restrict the possible responses to powers of
              2.  The maximum is 32768 bytes (the largest power of 2 less than or
              equal to 65464.)

       tsize (RFC 2349)
              Report  the size of the file that is about to be transferred.  This
              version of tftpd only supports the tsize option for binary  (octet)
              mode transfers.

       timeout (RFC 2349)
              Set the time before the server retransmits a packet, in seconds.

       utimeout (nonstandard)
              Set  the  time before the server retransmits a packet, in microsec-
              onds.

       The --refuse option can be used to disable specific options; this  may  be
       necessary  to  work  around  bugs in specific TFTP client implementations.
       For example, some TFTP clients have been  found  to  request  the  blksize
       option,  but  crash with an error if they actually get the option accepted
       by the server.