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What is the possible impact of switching 64 subnets to 70?

In this response, our IPv6 expert, Silvia Hagen, answers what the impact is of using 70 subnets instead of 64.

In your examples you are always using 64 subnets. We're now thinking about using 70 subnets. What is the possible impact of this?
The interface identifier, which compares to the host ID in IPv4, is defined to be 64-bits. We do not have address space limitations anymore with IPv6 as we used to have with IPv4, so I do not see the need to create a 70 prefix. If you really want to do this, you can, but you will break the autoconfiguration mechanism because that is based on the 64-bit interface ID.
This was last published in October 2006

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