Hello @lagapidis
My LAB contain only two routers one is the PPPoE server and the other is PPPoE client :-
And yes you are right based on my previous message the pings were failing at a size of 1493 bytes and this happened only when DF-bit set to 1, so this mean the fragmentation occur when the packet size is above 1492 bytes and as I know the IP MTU command tell the router at which size in bytes the IP packet should be fragment and since the IP MTU on both virtual-template and dialer interfaces are 1500 bytes why the fragmentation occur when the packet above the 1493 bytes and not above 1500 bytes ??
How can ping sweeps help me to figure out this ?? as I know the ping sweep increase the packet size progressively to see at which point the fragmentation occur but I already know that it’s occur at 1492 !!
If my question not clear let me know ???