Re: RFC 2553 bind semantics harms the way to AF independence

[Francis Dupont]

 In your previous mail you wrote:

   > => you can use it with the V6ONLY stuff.
   
   yes, but on rfc2553-compliant system you cannot have both an AF_INET
   and an AF_INET6 socket listening on the same port.
   
=> you can do it with the V6ONLY stuff. (again)

   > => this is the standard way but with the V6ONLY way you can use the
   > single socket (my favorite) or the socket per IP version (Itojun's
   > favorite). The user shall choice his own favorite or the one which
   > matches the application constraints.
   
   the user can't choose anything! if he wants to listen both ipv4 and ipv6
   traffic, he has to use an AF_INET6 socket with V6ONLY turned off.
   no other choice.
   
=> no, he can use one socket for both versions or two sockets, one per
version, with V6ONLY turned on. The V6ONLY stuff was specified in order
to enable that (because BIND 9 needs that for its filtering).

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