THE MAJOR DIFFERENCE BETWEEN IPv4 and IPv6

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 The major differences between IPv4 and IPv6 

IPv4 (Internet Protocol Version 4)IPv6 (Internet Protocol Version 6)
Encryption and authentication is not provided in IPv4 (Internet Protocol Version 4).Encryption and authentication is provided in IPv6 (Internet Protocol Version 6)
Header of IPv4 is 20 – 60 bytes.Header of IPv6 is fixed at 40 bytes
Checksum field is available in IPv4.Checksum field is not available in IPv6.
Packet flow identification is not available in IPv4 (Internet Protocol Version 4).Packet flow identification is available in IPv6. Flow label field is available in the header.
IPv4 addresses are usually represented in dot-decimal notation, consisting of four decimal numbers, each ranging from 0 to 255, separated by dots.An IPv6 address is represented as eight groups of four hexadecimal digits, each group representing 16 bits.
Sender and forwarding routers performs fragmentation in IPv4Fragmentation is performed only by the sender in IPv6.
In IPv4, security features relies on applicationIn IPv6, there is an inbuilt security feature named IPSEC.
End to end connection integrity cannot be achieved in IPv4.End to end connection integrity can be done in IPv6.
IPv4 supports DHCP and Manual address configurationIPv6 supports renumbering and auto address configuration.
IPv4 addresses are 32-bit longIPv6 addresses are 128 bits long.
The address space in IPv4 is 4.29 ×109The address space in IPv6 is 3.4 ×1038
IPv4 has a broadcast message transmission scheme.Multicast and Anycast message transmission scheme is available in IPv6.

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