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= IPv6 =

 * 4 Types of adresses
   || Loopback            || 00...1  (128 bits)  || ::1/128 ||
   || Multicast           || 11111111            || FF00::/8    ||
   || Link-Local unicast  || 1111111010          || FE80::/10   ||
   || Global Unicast      || (everything else)   || ||


 * All hosts in IPv6 has the same link local subnet [[https://www.edge-cloud.net/2013/08/07/ipv6-link-local-addresses-as-default-gateway/|fe80::/10]] see [[https://tools.ietf.org/html/rfc4291|RFC4291]]
   * Thus we can use the same default GW on each host !!!  '''fe80::1'''

 * While [[ipv4|IPv4]] has a fixed limit of around 4 billion IP addresses, IPv6 will have exponentially more, on the magnitude of around 340 billion billion billion billion (3.4×1038).

 * Next gen ip protocol
   {{{
      As the 4 billion IPv4 addresses run out sometime early next decade (current estimates: 2011-2012), the Internet will stop growing if we do not find ways to tackle the  exhaust. The successor to IPv4 - IPv6 - allows 340 undecillion addresses or more than 50 billion billion billion per person on earth.
   }}}
 * PI - Provider independent IP block [[http://etherealmind.com/importance-provider-independent-ipv6-addresses/|Importance]] for dual homing.
 * http://www.youtube.com/watch?v=sKMvGIHXgBg&feature=related

== Address plan examples (2015) ==
 * Only first half /64 used, last half of ipv6 is for host-ID
 * Big company's may be issued with /32 IPv6 space.
 * Best practice is to use /48 for a site, with /64 for individual subnet's.
 * Two main chains of thought for sub-netting
   1. Regional, e.g. Country, Site, Building, allowing for summerisation
   1. Functional, e.g Function, Site etc. allowing for security rules based on a prefix mask.
||/40 L1    || /48 L2   ||/56 L3   ||/64    ||
||Pop-WWW   || Customer || Sites   ||unspec ||



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CategoryNetwork