>>   A: a server creates two sockets, one binds to IPv4 address, and the
>> other binds to IPv6;

> This cannot work with bindv6only=0, and is the real problem we need to
> solve.

Yes, it can.  You just need to bind the sockets in the right order (v4
before v6).

Marco, I am unable to find any rationale for this change.  I stand by my
opinion, which is that the change

  * is incompatible with other Linux systems;
  * contradicts RFC 3493 Section 3.7;
  * breaks a bunch of software, notably all Java software.

I therefore strongly urge you to revert it.

I would be grateful to hear any rationale in favour of the new default.

                                        Juliusz


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