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 fe80::/10 see RFC4291

  • Thus we can use the same default GW on each host !!! fe80::1

• While 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 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
  2. Functional, e.g Function, Site etc. allowing for security rules based on a prefix mask.

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CategoryNetwork