Network Plus IPv6 Addressing Concepts

5/6/2013 IPv6 Addresses Not compatible with IPv4 128-bit address – 8 16-bit fields specified as 4 hex digits (0 – F) separated by colons. – Leading zeros unnecessary – :: may be used to specify a number of zero-value fields. FF22:00FF:002D:0000:0000:0000:3012:CCE3 = FF22:FF:2D::3012:CCE3 – The substitution of :: for multiple zero-value fields can only be used once.

5/6/2013 IPv6 Address Scopes Unicast address (link-local) – FE80: … (link-local – packet not routable) – (“FE8”, “FE9”, “FEA” or “FEB”) – FEC0:.. (site-local – not routable on public Internet) – (“FEC”, “FED”, “FEE” or “FEF”) – Nnnn: (Internet) Multicast – Send to all computers in a multi-cast group – FF0x: … (x represents the multicast group) Anycast address – Standard unicast address assigned to multiple machines – Used with routers to all nearest router to accept the packet – Packet can be accepted by first available device

5/6/2013 IPv6 Address Types

Link Scope 5/6/2013

Aggregatable Global Address Used on Public Internet routers Designed from its foundation to support efficient, hierarchical addressing and routing – Summarized to produce an efficient routing infrastructure Start with 001 in first three bits. (2:: or 3::) 5/6/2013

IPv6 Subnetting Does not use Classes – every IPv6 address is classless – No subnet masks First 64-bits network id (Subnet Prefix) and last 64-bits is the interface id. – Interfaces that share subnet prefix on same subnet

5/6/2013

Route Prefix Interfaces that belong to same route Vary in length defined by “/” – 2608:FE10::/32 Example: National NSP assigns regional ISP 32-bit route: 2608:FE10::/32 Regional ISP assigns a local ISP a 48-bit route block prefix: 2608:FE10:1::/48 Local ISP assigns business 2608:FE10:1:A::/64 5/6/2013

The End