Bug#391280: apache2-mpm-prefork: doesn't bind to IPv4 socket when IPv6 enabled

[Jarek Kamiński <jarek@vilo.eu.org>]

On Sun, Mar 16, 2008 at 08:46:04PM +0100, Stefan Fritsch wrote:
> On Friday 14 March 2008, Michael Mende wrote:

Sorry for late reply, I haven't got copy of this mails.

>> From apache docs [1]:
>>
>> "On the other hand, on some platforms such as Linux and Tru64 the
>> only way to handle both IPv6 and IPv4 is to use mapped addresses."
>> Mapping is default on Linux (in contrary to FreeBSD, NetBSD, and
>> OpenBSD).
> 
> I think the problem here is that for Apache, enable/disable-v4-mapped 
> is a compile-time option, but for linux the behaviour can be changed 
> at runtime by writing to /proc/sys/net/ipv6/bindv6only. Supporting 
> both variants without recompiling apache looks like a valid feature 
> request. It is possible that apache upstream is not aware of 
> the /proc interface.

Yup, that's my case.
#v+
[jarek@vilo ~]% /sbin/sysctl net.ipv6.bindv6only
net.ipv6.bindv6only = 1
#v-

> Maybe we should put a hint in README.Debian that our apache supports 
> only net.ipv6.bindv6only = 0 at the moment.

Please don't require reconfiguring whole system. If it's only
configuration supported by apache, maybe it should setsockopt
(IPV6_V6ONLY) its sockets? This way it could revert to
net.ipv6.bindv6only=0 only on its sockets, without touching rest of
system.

Cheers, Jarek.

-- 
    Linux jest darmowy, jeśli twój czas nie przedstawia żadnej wartości.
    Jeśli jest coś warty(czas), Linux jest po prostu tańszy od innych.
	Jarek Kamiński
	gg# 453620