Code Review 6882910: Unexplained lack of IP4 network ability when transparent IP6 to IP4 is disabled.

[Alan Bateman]

Chris Hegarty wrote:
> Alan,
>
> Don't assume sockets will default to dual stack, explicitly set 
> IPV6_V6ONLY to 0. Apparently some Linux distros ship with 
> net.ipv6.bindv6only=1 restricting sending and receiving to IPv6 
> packets only. Changes both net and nio code.
>
> Webrev:
>   http://cr.openjdk.java.net/~chegar/6882910/webrev.00/webrev/
>
> Thanks,
> -Chris.
The changes look okay to me. I assume the bulk of our existing tests 
will fail if we run on a system has IPV6_V6ONLY enabled by default (and 
so a new test isn't required for this fix). One small suggestion is just 
to add a comment to explain why the socket option needs to be disabled.

-Alan.