From: ibuprofin@painkiller.example.tld.invalid   
      
   On Wed, 12 Jun 2013, in the Usenet newsgroup comp.protocols.tcp-ip, in article   
   , Rick Jones wrote:   
      
   >The starting point is this, in pseudo IEEEspeak (which I've probably   
   >botched) with a smattering of IETF style:   
      
   >    All stations in the same broadcast domain MUST have the same MTU.   
      
   Wrong   
      
   >Ethernet has no way to communicate frame size between peers.  If a   
   >frame larger than the station is prepared to receive arrives, that   
   >frame will be dropped.   
      
   Nope - if you want to transmit packets no larger than 500 octets in a   
   link where everyone else is doing 1500, that's your business. See   
   RFC1122 and read about fragmentation and reassembly.   Then look at   
   my reply to Barry - specifically the output of 'ifconfig' and the   
   tcpdump.  One system with MTU 1280, one with 1500 and no problems.   
      
   >However, if the interface on which it was going to receive the   
   >datagram has an MTU/framesize smaller than the size of the datagram   
   >sent, the datagram won't be "received" by the IP layer so it cannot be   
   >resent, so the Path MTU logic cannot trigger.   
      
   >Thus the reason why all stations (hosts, systems, what you will) in   
   >the broadcast domain (everything joined at layer 2 eg ethernet) MUST   
   >have the same MTU.   
      
   Rick, what are you smoking?   Can I get some?   ;-)   
      
           Old guy   
      
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