George Borisov wrote: > Matt Ryan wrote: >> Testing using 'ping -s >> 1500 <dest_ip>' is the best option to check everything will work. > > This always worked, regardless of the other problems we were having. My bad. Install the iputils-ping package (if its not already) and use 'ping -s 1472 -M do <dest ip>'. Increment/decrement the '-s' parameter until you see where the MTU breaks. Matt.