Every time I write about IPv6 multihoming issues and the need for NPT66, I get a comment or two saying “but I thought this is already part of IPv6 stack – can’t you have two or more IPv6 addresses on the same interface?” The commentators are right, you can have multiple IPv6 addresses on the same interface; the problem is: which one do you choose for outgoing sessions.
The source address selection rules are specified in RFC 3484 (Greg translated that RFC into an easy-to-consume format a while ago), but they are not very helpful as they cannot be influenced by the CPE router. Let’s look at the details.
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