Unless you're deploying network appliances, you can assume you will have a dual stack supporting IPv4 and IPv6 and the Basic API for IPv6. If you are doing a network appliance, that will work too, but will be more complex, and may not contain a dual stack. Find out what releases and versions exist and if there will be any hardware upgrades required. After this, determine what transition tools you will need for IPv6 and IPv4 to coexist in your environment. The long list is beyond the scope of this article.
Users can use site-local addresses.
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