[Bug 24828] Re: IPv6 should be disabled by default

[Fabio Massimo Di Nitto]

Remi, restoring IPv6 is a matter of adding/uncommenting a line in
interfaces or removing the blacklist. I don't believe that it can be
such big source of headackes.

What MacOS does is also not completely proper. I can have only link-local address and use them to connect from one machine to another with proper entries 
in the DNS. How your solution would address this case if AAAA query will not be available?

Fabio

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IPv6 should be disabled by default
https://launchpad.net/bugs/24828