Further notes on Fragmentation
Performance: single fragment lost => entire packet useless. Waste of resources all along the way. Ref: Kent & Mogul, 1987
Don’t Fragment (DF) bit set => datagram discarded if need to fragment. ICMP message generated: may specify MTU (default = 0)
Used to determine Path MTU (in TCP & UDP)
The transport and application layer headers do not appear in all fragments. Problem if you need to peep into those headers.