From: grahn+nntp@snipabacken.se   
      
   On 6 Feb 2009 09:31:29 GMT, Jorgen Grahn  wrote:   
   > On Fri, 06 Feb 2009 05:55:41 +0100, Ralf  wrote:   
   >> David Schwartz wrote:   
   ...   
   >> >> BTW, is it possible to send a payload within a SYN packet?   
   >> >   
   >> > Not easily.   
   >>   
   >> :-) But your answer indicates that it somehow still is possible.   
   >> I would like to learn how to do it.   
   >> A 6 bytes payload in the 1st SYN packet would be sufficient for me,   
   >> it can also be placed in some unused header fields if there are any such.   
   >   
   > I assume David meant that the RFC kind of allows it, but that you   
   > cannot make the BSD sockets API send it, and circumventing the TCP   
   > part of the stack is painful/unfeasible.   
   >   
   > Also, I think an earlier discussion here (where I asked the question)   
   > showed that no modern TCP implementation at the other end would accept   
   > it. I guess it would refuse the connection altogether, not just   
   > discard that segment.   
      
   And the mandatory question: what are you really trying to do, what   
   problem are you trying to solve? There are probably easier, more   
   normal ways.   
      
   /Jorgen   
      
   --   
     // Jorgen Grahn           R'lyeh wgah'nagl fhtagn!   
      
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