XPost: comp.os.linux.networking   
   From: markhobley@yahoo.donottypethisbit.co   
      
   On Sat, 25 Sep 2010 18:53:41 +0000, Mark Hobley wrote:   
      
   > The application that is communicating to the foreign host, may use a   
   > smaller segment size for its communications to the foreign host   
      
   Actually, this raises an interesting question: Supposing that I am using   
   HTTP protocol, via a remote proxy to a webserver as follows:   
      
   Machine A	Machine B	Machine C   
   Browser		HTTP Proxy	Web Server   
      
   Machines A and B above have a Maximum Segment Size of 1500. However, the   
   web server machine (C) has a smaller Maximum Segment Size (lets say 512).   
      
   Does Machine B tell Machine A that the Maximum Segment Size is 512, so that   
   queries from the browser are enclosed in segments of that size? Or does the   
   browser still send its queries in segments of 1500, and the proxy server   
   fragments them into smaller 512 segments? If the proxy server is fragmenting   
   them, then presumably this defeats the object of using PMTUD in the first   
   place, in which case, wouldn't it be better to not bother with PMTUD?   
      
   Mark.   
      
   --   
   Mark Hobley   
   Linux User: #370818  http://markhobley.yi.org/   
      
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