The IPv6 header consists of a header and optional extension header. Protocol type by next header, time to leave by Hop limit and type of service by traffic class. IPv6 further replace the datagram length by payload length. Both keep the version, IPv6 jumps header length, ID, flags, offset and a header checksum. Let's take an overview of IPv4 and IPv6 comparison.
So as to speed to a processing of each packet header, all fields are of fixed size in IPv6. IPv6 uses 128 bits for addressing that can support 3.4x10 to the 36 hosts. Two major changes from IPv4 to IPv6 a longer address field and the simplified header format. New version IPv6 was designed to interoperate with IPv4 since it would take years to complete the transition from v4 to v6. However, 32 bits of the IPv4 address eventually cannot accommodate its explosive growth. IPv4 has played an essential role in the internet working for many years. Rule 3: When zeros (0s) are present in discontinuous pattern in IPv6 address notation, then at only one junction, the zeros (0s) are replaced with .We discuss IPv6 in today's lesson. This rule is also known as leading zero compression.
However, you cannot apply this rule to trailing zeros (0s). Removing leading zeros (0s) does not have any effect on the value. If the field contains all zeros (0s), you have to leave one zero (0) remaining. But each block in which you do this, have at least one number remaining. Rule 2: Leading zeros (0s) in the 16 bits field can be removed. This rule is also known as zero compression. Rule 1: When there are continuous zeros (0s) in the IPv6 address notation, they are replaced with. Therefore, several rules are developed to compress and shorten the IPv6 address for convenience of the user. It's a pain in typing all those hexadecimal characters in the IPv6 address. Consider a situation where you have to ping the expanded IPv6 address to check the network connectivity. But IPv6 addresses are lengthy and challenging to use. With time, people are shifting from IPv4 to IPv6 addresses and also perform IPv4 to IPv6 conversion.
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