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

Silvia Hagen EXPERT RESPONSE FROM: Silvia Hagen

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QUESTION POSED ON: 16 October 2006
In your examples you are always using 64 subnets. We're now thinking about using 70 subnets. What is the possible impact of this?

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EXPERT RESPONSE
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.


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