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www.cisco.com/web/about/ac123/.../ipv6_internals.html

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Posted by crouse

rfc.sunsite.dk/rfc/rfc1924.html

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Posted by crouse

IPv6 (also known as IPng “IP next generation”) is the new version of the well known IP protocol (also known as IPv4). Like the other current *BSD systems, FreeBSD includes the KAME IPv6 reference implementation. So your FreeBSD system comes with all you will need to experiment with IPv6. This section focuses on getting IPv6 configured and running.

In the early 1990s, people became aware of the rapidly diminishing address space of IPv4. Given the expansion rate of the Internet there were two major concerns:

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Running out of addresses. Today this is not so much of a concern anymore since RFC1918 private address space (10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16) and Network Address Translation (NAT) are being employed.
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Router table entries were getting too large. This is still a concern today.

IPv6 deals with these and many other issues:

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128 bit address space. In other words theoretically there are 340,282,366,920,938,463,463,374,607,431,768,211,456 addresses available. This means there are approximately 6.67 * 10^27 IPv6 addresses per square meter on our planet.
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Routers will only store network aggregation addresses in their routing tables thus reducing the average space of a routing table to 8192 entries.

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Posted by priyadarshan

Dear its 128bit long address.

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Posted by sagitraz