IPv6 addresses are 128-bit addresses, made up of 8 sections of 4 hex values.Speaking of IPv6, here are a few things worth mentioning before we get into formatting and playing with zero’s: Unbelievable really how much simpler it is, shaving off the really unnecessary fields, and adding a bit more QoS flexibility along with the curious Hop Count field that seems pretty odd for the next evolution in IP Addressing.Īs I’ve already mapped what fields are equivalent from IPv6 to IPv4, here is what got dropped completely moving from IPv4 to IPv6 headers:Ībove is a good, straight forward description of the Header differences, and is stinking of some kind of exam question so make sure to review these.
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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