Difference between ipv4 and ipv6......??

as above person said, thats the difference... well from technical point of view 1ipv4 takes 32 bit addressing....ipv6 takes 128 bit addressing 2in ipv4 header, all options come under a single header....in ipv6 options come with optional extension headers...like we can specify options related to routing in a separate header, indicating the presence of routing header in another header(usually hop by hop options header). 3in ipv6 we dont have fields for checksum, fragment flags,offset etc... 4ipv6 has built in support for authentication 5ipv4 payload is limited,meaning it can carry only limited data....ipv6 can carry any amount of data by using jumbo packets. 6in ipv4 fragmentation of packets is performed at router level..in ipv6 source must only perform fragmentation by finding out MTU along the path...it reduces fragmenting overhead on router.