From: grahn+nntp@snipabacken.se   
      
   On Wed, 2011-09-14, Alfred Nagl wrote:   
   > martinfnp@yahoo.com wrote:   
   >   
   >> Can somebody help? How is TCP/IP stack designed in OSes if different   
   >> physical   
   >> drivers with different physical maximal size of frames need to be   
   >> transferred? Does IP stack do any interrogation during startup   
   >> procedure to investigate how much is maximal length of the frame of   
   >> particular device - e.g. Ethernet, FDDI, WiFi? Thanks.   
   >   
   > You may want to read about PMTU:   
   > and MSS:   
      
   Seems to me he's not talking about the path, but about the link --   
   "particular device" etc.   
      
   To answer the original question: of course IP must know about the   
   capabilities of the various link layers on the local host. And of   
   course it can find out.  It can't be done during "startup" though on   
   any OS I know of, since network devices may come and go.   
      
   /Jorgen   
      
   --   
     // Jorgen Grahn    O  o   .   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)