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

[Chris Hegarty]

Alan Bateman wrote:
> 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 

This is correct. We have many many failures of existing tests on 
platforms with IPV6_V6ONLY enabled by default.

> 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.

Updated webrev (added comment):
  http://cr.openjdk.java.net/~chegar/6882910/webrev.01/webrev/

Thanks,
-Chris.

> 
> -Alan.