If you have consecutive fields of zeroes, they can be expressed with two colons. Zero Compression And Leading Zero Compression With IPv6, our non-compressed address has eight sections of four hex values, separated by a total of seven colons. There are some IPv4 fields that are not represented in IPv6: source address, destination address – they’re now 128 bits.next header – Equivalent to IPv4’s Protocol field.hop limit – Roughly equivalent to IPv4’s Time To Live (TTL) field. Every hop decrements this counter by one, and when that counter hits zero - the “time to live” becomes the time to be discarded.payload length – IPv4’s equivalent is the Total Length field.This also helps with QoS, allowing us to prioritize traffic flows rather than individual packets. flow label – No equivalent in IPv4, this field allows a packet to be labeled as part of a particular flow.The “traffic class” name comes from this field’s ability to allow us to assign levels of importance to a packet via QoS. traffic class – In IPv4, this was the Type Of Service (TOS) field.
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