IPv6: Introduction & Zero Compression Technique

15 Aug

ccieme

Why IPv6?

  • IPv4 exhaustion
  • IPv6 addressed are 128-bits in size, offering a hugh amount of addresses. (IPv4 being 32-bits)
  • IPv6 doesn’t use broadcasts
  • NAT will be a thing of the past. NAT is also a hinderance to progression.
  • IPv6 was designed with route aggregation/summarisation in mind.
  • IPv6 offers greater security capabilities
  • DHCP is still available, but IPv6 nodes can assign themselves an address without the help of a DHCP server via autoconfiguration.
  • QoS capabilities with IPv6 are far greater, due to many more values within the IPv6 header.

IPv6 + IPv4 Headers

93_ipv6_fig1_lg

There are eight header fields in IPv6:

  1. version – This is set to “6” in IPv6.
  2. traffic class – In IPv4, this was the Type Of Service (TOS) field. The “traffic class” name comes from this field’s ability to allow us to assign levels of importance to a packet via QoS.
  3. flow label – No equivalent in IPv4, this field…

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