5be809bd   
   From: boite-a-spam@plouf.fr.eu.org   
      
   Hello,   
      
   David Schwartz a écrit :   
   >   
   > I can't figure out what you're talking about. What does "enable PMTU   
   > on our end-points" mean? You mean enable PMTU detection?   
      
   PMTU discovery, I guess.   
      
   > If the   
   > endpoints do PMTU detection, it doesn't matter what the middle does.   
   > The endpoints will figure out the largest packet that arrives   
   > unfragmented.   
      
   Unless some device in the middle behaves badly and does not send an ICMP   
   "fragmentation needed (and DF set)" (or ICMPv6 "packet too big" if using   
   IPv6) message when discarding too big a packet. As an example I can   
   think about some xDSL architectures cascading PPPoE links (MTU 1492) and   
   L2TP tunnels with MTU 1500 at the link layer level without intermediate   
   routing.   
      
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