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Calculating subnets for IP addresses in IPv6

Understand how subnetting in IPv6 differs from that of IPv4 and what you need to do in order to calculate the subnet of an IP address in IP version 6.

How do you do subnetting in IPv6?
A customer usually gets a /48 address prefix from his provider. So he has 16 bits left for subnetting. You should not further subnet (i.e., do not use bits from the interface ID for subnets) because then the autoconfiguration mechanism would fail.
This was first published in December 2008

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