Which in contrast to an IPv4 Header is amazingly simpler to look at and quickly understand what is what for the most part, here is the IPv4 Header: Source and Destination = Equivalent to IPv4’s Src & Dst address fields, however has an IPv6 128-bit source and destination address.Hop Limit: Equivalent to IPv4 TTL (Time to Live), decrements each “hop” until it hits zero, at which point the packet quits hopping (gets discarded).Next Header: Equivalent to IPv4’s Protocol field (IP protocol type).Payload Length: Equivalent to IPv4’s Total Length field, defines the entire packet size including the header and data.Flow Label: Has no IPv4 equivalence, Labels a packet to be in a certain traffic flow (data, voice, etc), helps to set QoS for an entire traffic flow rather than packet by packet.Traffic Class: Equivalent to IPv4 Headers ToS (Type of Service) field, used to assign priority levels to packets (QoS).Version: Equivalent to IPv4 Version field – Set to 6 obviously □.Above, is seen an IPv6 packet Header, which contains 8 fields:
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