Re: draft-cmetz-v6ops-v4mapped-api-harmful-00.txt and draft-itojun-v6ops-v4mapped-harmful-01.txt

[Pekka Savola <pekkas@netcore.fi>]

On Sat, 13 Sep 2003, Francis Dupont wrote:
>  In your previous mail you wrote:
>    On Fri, 12 Sep 2003, Francis Dupont wrote:
>    >  In your previous mail you wrote:
>    > 
>    >    Francis, could you clarify how your local credo translates to how you'd 
>    >    like to, for example, port applications to IPv6?
>    >    
>    > => I replace all AF_INET by AF_INET6, gethostbyname() by getaddrinfo(),
>    > gethostbyaddr() by getnameinfo(), etc. I use one socket at the
>    > server side because I consider there is only one IP, in the API it
>    > becomes IPv6 with IPv4 space injected (in the math meaning) into
>    > the IPv6 space as IPv4-mapped IPv6 addresses.
>    
>    What about client apps -- do you set up AI_MAPPED flag when doing 
>    getaddrinfo?
>    
> => AI_MAPPED? I believe you mean AI_V4MAPPED, it doesn't really matter
> for a client, i.e., you can use AF_UNSPEC or AI_V4MAPPED|AI_ALL.
> The important flag is AI_ADDRCONFIG (we have some IPv6 only boxes here).

AI_ADDRCONFIG could be useful, I guess, if it was properly defined and 
implemented.
 
> I still don't want to reopen this endless discussion, so I don't answer
> to the rest of the message in the list.

Well, then don't open the "mapped addresses or not" discussion, but I at
least would like to hear how the applications which previously assumed
IPv4 addresses and do things with them (consider sendmail and RBL+) see
the mapped addresses.. and how you propose to fix (or document) that.

The discussion will have to be had anyway.  As it stands the application
transition document is *NOT* going to revisit the "deprecate" vs
"not-deprecate" the mapped addresses discussion.  However, it aims to give
guindance how to implement the application transition with or without
mapped addresses (as the app writer sees best) the best way possible (the
best way with mapped addresses is still unclear, I think!).

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings