[CentOS] transition to ip6

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Hi Adam, 

> Typically the routing table does a lot of work.   Much like 127.0.0.0/8
> the mask of a link-local will make it unprefered by 'public' traffic.
> There is also a syntax for specifying the outbound interface for
> traffic.

Routing tables won't do much for you when you have several different IP addresses (stateless autocnfigured, privacy extension and static) within the same network on the same physical interface - they'll all use the same route. The longest match algorithm would more or less lead to a random choice of source addresses. 

If you want a specific source address to be used, you have to specify it ... no big deal, though. bind() hasn't changed that much. 

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