From: lacos@caesar.elte.hu   
      
   On Mon, 27 Sep 2010, Mark Hobley wrote:   
      
   > My next question now is how likely is it that a router shunting internet   
   > traffic has a maximum segment size of less than 1500, (before reaching   
   > the destination network)? Is fragmentation en-route likely, or is this   
   > most likely to start occuring on the destination LAN?   
      
   I know of a big ISP in .hu whose ADSL modems have an MTU of 1492 bytes.   
   (Excuse the sloppy wording.) Now that I tried to google it, it seems that   
   the limit of 1492 is inherent in PPPoE. This page:   
      
   http://www.mynetwatchman.com/kb/ADSL/pppoemtu.htm   
      
   suggests an even smaller MTU (1454 bytes).   
      
   lacos   
      
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