What is the Don Fragment option?
Ans. Whenever a router gets a datagram with Don’t Fragment (DF) bit set in its header and the packet size is greater than the next MTU, the router cannot forward the packet. In such a case, the router sends an ICMP Destination Unreachable DF bit set message to the host. Typically, an IP datagram cannot be forwarded because its maximum segment size is too large for the receiving server and the Don’t Fragment bit is set in the header of the datagram.
