I have one example scenario, let consider i am sending 1500 bytes of frame over the internet. which is passing through 576 bytes MTU capable router.
My question is, Is that router will do the fragmentation and send to receiving host or it will send ICMP(code3 type4) to sending device by PMTU for fragmentation. How this thing is happening in real time in the world. Sometime in real world scenario router will block ICMP message by administrator , how they are overcoming this issue.