why does router only incude datapart for fragmentation.why doesn't it include ip header also as datapart during fragmentation like it includes header of tcp/udp?
fragmentation has done by routers because of capacity of data link layer is less than the network layer .for ex. standard Ethernet can only send data of 1500 bytes .where network layer can send data of( 65535-20) bytes.
the whole fragmentation is done by the router on network layer .so,is that the reason of excluding header of ip Packet ?
please clear it . its hazy for me . Thank you