From: gah@ugcs.caltech.edu   
      
   Rick Jones  wrote:   
   (snip)   
      
   > The spec allows for data to be present in the SYN|ACK, as well as the   
   > SYN.  One can even have "christmas tree" segments with SYN, data and   
   > FIN.  However, presently, data in the SYN segment is not supposed to   
   > be presented to the application until the handshake is complete.   
      
   Looking at the state diagram in my Comer book, it isn't obvious   
   that SYN+FIN works.  But it might be that it is simplified.   
      
   I do now believe that either SYN or SYN+ACK can have data.   
      
   I was wondering if you could do.   
      
   SYN+data+FIN   (packet one)   
      
   SYN+ACK+data+FIN  (reply, packet two)   
      
   ACK            (packet 3, all done)   
      
   That does depend on the server actually looking at the   
   data before it sends the ACK, though.   
      
   Also, I had forgetten that the SYN+ACK can be separate, SYN and ACK   
   to handle the case where both sides try to open at (about)   
   the same time.   
      
   -- glen   
      
   --- SoupGate-Win32 v1.05   
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