Comments on addr-select-sol

[Rémi Denis-Courmont <rdenis@simphalempin.com>]

	Hello,

Been reviewing the draft, and I am a bit puzzled as to why the 
implementability and compatibility with RFC3493 falls in the "other issues" 
category.

Most IPv6-enabled applications are currently relying on getaddrinfo then 
connect/sendto APIs, or variants thereof. getaddrinfo() queries DNS or 
whatever, and gives an ordered list of possible destination address, then 
connect() or sendto() decide which source address to use to reach a given 
destination. It might be worth noting that sendto() is non-blocking, so 
essentially any exchange with the network has to be done in getaddrinfo().

Now, that still leaves a lot of room for doing lots of fancy and advanced 
stuff in getaddrinfo(), along the DNS query. But I think it is worth looking 
deeper at. I do think we should avoid deprecating RFC3493 unless there is 
really a very very compelling reason to do so.

I am a bit suspicious as to whether the "trial-and-error" approach can 
actually work with these considerations in mind.

-- 
Rémi Denis-Courmont