From: m@rtij.nl.invlalid   
      
   On Thu, 20 Jun 2013 16:40:19 +0000, Rick Jones wrote:   
      
   >> response by architects and admins to the PMTU troubles in said network   
   >> was even more moronic. All token ring interfaces had their MTU set to   
   >> 1500. I did predict that the first tunnel would cause no end of   
   >> trouble, which it did.   
   >   
   > You had Ethernet and TokenRing networks joined just at Layer2?   
      
   No, layer 3. Hence the PMTU blackholes.   
      
   >   
   >> In the end, as we were responsible for said tunnel, we just forcibly   
   >> stripped of the DF bit as it was impossible to convince the network   
   >> owners of the correct solutions.   
   >   
   > adde parvum parvo magnus acervus erit :)   
   >   
   > Arbitrarily clearing the DF bit - might as well have set   
   > ip_pmtu_strategy to 0 on the HP-UX systems and disabled PathMTU   
   > discovery at the root.  Or, if things were otherwise OK apart from what   
   > you described below, there was always the value of 1 which set DF always   
   > without any of the ICMP Echo Requests being sent (which was value 2)   
      
   Besides that we did not control said stuff, we could not convince the   
   "architects" that what they mandated was plain dead wrong. That means you   
   have to resort to solutions like this. (There also was some politics   
   involved....)   
      
   M4   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)