Re: v6ops-v6onbydefault: link-locals and AI_ADDRCONFIG

[itojun@itojun.org (Jun-ichiro itojun Hagino)]

> So, I'll conclude by a few questions to give food for thought:
> 
>  - does this seem like a  problem, that is, should getaddrinfo() + 
>    AI_ADDRCONFIG perform AAAA DNS queries etc. if 
>    the node only has v6 link-local/loopback addresses?
> 
>  - is getaddrinfo() + link-local addresses something we should support?
> 
>  - should this be fixed by e.g.:
>    a) recommending that the implementations filter out link-locals as well 
>       when doing AI_ADDRCONFIG (a BCP/Info document)
>    b) specifying additional semantics for AI_ADDRCONFIG
>    c) specifying a new hint which would perform this

	d) obsolete AI_ADDRCONFIG.  AI_ADDRCONFIG semantics is too vague, and
	way too difficult to specify (for instance, if you have IPv6 global
	unicast address and no route, is it configured?).  also, even without
	AI_ADDRCONFIG programs work just fine (socket(2) or connect(2) will
	issue the right error).

itojun