From: ibuprofin@painkiller.example.tld.invalid   
      
   On Fri, 14 Jun 2013, in the Usenet newsgroup comp.protocols.tcp-ip, in   
   article , Rick Jones wrote:   
      
   >Moe Trin  wrote:   
      
   >> You said they're back-to-back, so the only thing I can think of is   
   >> this is a artifact of the receiving system not being aware that   
   >> jumbos were in use.   I don't know.   
      
   >Indeed - it is an example of two stations in the broadcast domain who   
   >were using different frame/MTU sizes :)   
      
      
   Frame, yes - MTU ?  The receiving stack didn't even see it, so we   
   haven't gotten to the MTU level.   
      
   >It has always been my understanding though that PTMU black holes were,   
   >99 times out of 10, triggered by overly aggressive ICMP filtering.   
      
   That's pretty much what RFC1435 and RFC2923 indicate.   
      
           Old guy   
      
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