68 IPv6 ConfigurationWh n configuring IPv6, go to these e sections for information you are interested in:z IPv6 OverviewIPv6 Configuration Task Listzration Examplez IPv6 ConfiguIPv6Engineering Task Force (IETF) as the successor to Internet Protocol Version 4 (IPv4). The significanttween IPv6 and IPv4 is that IPv6 increases the IP address size from 32 bits to 128 bits.IPv6Header fore IPv6 address size is four times that of IPv4 addresses,he Options field). For theOverviewInternet Protocol Version 6 (IPv6), also called IP next generation (IPng), was designed by the Internetdifference beFeaturesmat simplificationIPv6 cuts down some IPv4 header fields or moves them to extension headers to reduce the overhead ofthe basic IPv6 header. IPv6 uses a fixed-length header, thus making IPv6 packet handling simple andimproving the forwarding efficiency. Although ththe size of the IPv6 header is only twice that of the IPv4 header (excluding tspecific IPv6 header format, see Figure 68-1.Figure 68-1 Comparison between IPv4 header format and IPv6 header formatAdequate aaddress are both 128 bits (16 bytes) long. IPv6 canprovide 3.4 x 1038 addresses to completely meet the requirements of hierarchical address division aswell as allocation of public and private addresses.ddress spaceThe source IPv6 address and the destination IPv668-1
