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IPv6:
IPv6 or IP version 6 is the next generation Internet protocol which will eventually replace the current protocol IPv4. IPv6 has a number of improvements and simplifications when compared to IPv4. The primary difference is that IPv6 uses 128 bit addresses as compared to the 32 bit addresses used with IPv4. Among other things, this improvement is expected to make assigning address to wireless devices easier and accommodate the myriad smart network enabled devices that will surround us in the future.
IPv6 and IPv4 will coexist on the Internet for quite a while. Currently much of the IPv6 Internet exists as tunnels over the existing IPv4 Internet.
You can find more information on the SixXS Website.
IPv6 Index :
Free DNS Hosting (Hurricane Electric)
Since the 1980s it has been apparent that the number of available IPv4 addresses is being exhausted at a rate that was not initially anticipated in the design of the network. This was the motivation for the introduction of classful networks, for the creation of CIDR addressing, and finally for the redesign of the Internet Protocol, based on a larger address format IPv6. Today, there are several driving forces for the acceleration of IPv4 address exhaustion
The accepted and standardized solution is the migration to IPv6. The address size in IPv6 was increased from 32 bits in IPv4 to 128 bits, providing a vastly increased address space that allows improved route aggregation across the Internet and offers large subnetwork allocations of a minimum of 264 host addresses to end-users. Migration to IPv6 is in progress but is expected to take considerable time. Methods to mitigate the IPv4 address exhaustion are:
As of October 2010 predictions of exhaustion date of the unallocated IANA pool converge to between January 2011 and January 2012 |
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Examples:
If you are granted a /64 prefix like 2001:0470:d076:000e::/64 then what's left after /64 in the table above is XXXX:XXXX:XXXX:XXXX. You have XXXX:XXXX:XXXX:XXXX (0000:0000:0000:0000 - FFFF:FFFF:FFFF:FFFF) at your disposal.
If you are handed a /124 prefix like 2001:0470:d076:000e:0000:0000:0000:102/124 then you are only left with X (0-F). Two are typically used to create the link, which leaves 14 IP's available to be used at your discretion.
The actual number of IPv6 in various subnet sizes
| Prefix | Number of IPv6 IPs | Space |
| 127 | 2 | none |
| 124 | 16 | x |
| 120 | 256 | xx |
| 64 | 18,446,744,073,709,551,616 | xxxx:xxxx:xxxx:xxxx |
| 48 | 1,208,925,819,614,629,174,706,176 | xxxx:xxxx:xxxx:xxxx:xxxx |
| 32 | 79,228,162,514,264,337,593,543,950,336 | xxxx:xxxx:xxxx:xxxx:xxxx:xxxx |
Requirements
You typically want/need a /64 for your home network. This is because /64 is the required size to use for autoconfiguraiton using radvd etc.. Smaller than /64 prefixes simply don't work with IPv6 autoconfiguration.
A /112 prefix (XXXX) or /96 (XXXX:XXXX) are nice sizes to allocate to each server in serverfarms etc.
The Hurricane Electric Certification tool will allow you to certify your ability to configure IPv6, and to validate your IPv6 servers configuration.
Through there test set you will be able to:
You will also demonstrate that you are familiar with IPv6 concepts such as:
Users say that the Hurricane Electric Free IPv6 certification service is both entertaining and educational.
Go to http://ipv6.he.net/certification/ to start NOW!
Here is my IPv6 Certification Badge:
Most popular:
Hurricane Electric IPv6 (/64 and /48 subnet) - http://tunnelbroker.net
SixXS (tunnel and /48 subnet) - http://www.sixxs.net
gogo6 (tunnel and /56 subnet) - http://gogonet.gogo6.com
Others:
NET6.at (/64 subnet) - http://www.net6.at
Russian Tunnelbroker (/64 subnet) - http://www.tunnelbroker.ru
AarNet (tunnel) - http://broker.aarnet.net.au
Malaysia IPv6 Tunnel Broker (/64 subnet) - http://tbroker.mybsd.org.my
Data here has been compiled from various sites.
No copyright infringement intended.