[jonathan <jonathan@xxxxxxxxxxxxxxx>]

> Which version of Ethereal are you using?  (Either run "ethereal -v" from
> the command line, or select "About" from the "Help" menu.)
> 
> In 0.8.14, however, the TFTP dissector was changed to use tvbuffs, so it
> should throw an exception if it tries to do that, and there should be a
> "Short Frame" or "Malformed Frame" error if that happens.
> 

I am using version 0.8.14. Thanks for the pointer to the TFTP options
RFC. However, the hex. display (which ethereal produces) still doesnt
map, even if I consider the 'options' RFC. The hex output maps  to
the etherenet header-ip header-udp header-tftp packet. So i can't see
where Ethereal is getting the information about the options from. Strange.
Thanks for your help. 

The URI is : www.comp.nus.edu.sg/~jonathan/ethereal