Default value of net.ipv6.bindv6only should revert to 0

[Kazuo Oishi <oishi@giraffy.jp>]

I have send this message to BTS and rejected.

md@Linux.IT (Marco d'Itri) writes:
>> Default value of net.ipv6.bindv6only should revert to 0.
> This has already been discussed on debian-devel and I do not see any new
> arguments here.

I have already read debian-devel archive, but I was not able to
found necessity to change default value of net.ipv6.bindv6only to 1.

Anyone, could you teach me why net.ipv6.bindv6only need to be set
to 1 globally, and why other good programs need to be changed?
I think it should revert.


http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=576633
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Default value of net.ipv6.bindv6only should revert to 0.

1. RFC 3493 explicitly allows applications to use AF_INET6 socket
to receive IPv4 connection.

2. If some applications want to restrict their use of an AF_INET6
socket to IPv6 communications only, they can use IPV6_V6ONLY.
It is effective even if net.ipv6.bindv6only is 0.
(In addition, RFC 3493 explicitly says IPV6_V6ONLY is turned off
(0) by default.)

3. Default value of net.ipv6.bindv6only is 0 in Linux kernel and
other Linux distributions.  We should never introduce such
meaningless incompatibility.


If an application does not work with net.ipv6.bindv6only = 1, it
does not mean that program is broken.

But if an application does not work with net.ipv6.bindv6only = 0,
it's broken as Linux application.
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-- 
Kazuo Oishi