Re: apache2's handling of IP version 6

[Stan Hoeppner <stan@hardwarefreak.com>]

On 10/3/2012 9:08 AM, Satoru Otsubo wrote:
> I'm Satoru Otsubo
> 
> I have some problems concerning apache2's handling of IP version 6.
> 
> My PC: Linux squeeze Japanese version clean install.
>  I use the normal apache2 package prepared by debian maintainers, that is, I did not compile apache2.
>  This is server use, that is, no Grafical User Interface.
> (Current kernel version: 2.6.32-5-686)
> 
> I think apache2 is using IPv4-mapped addresses, that is, apache2 lets only IPv6's ports open, and apache2 handles both the IPv6 and IPv4 tcp packets from IPv6's ports.
> Therefore I think apache2 normally has to listen IPv6's ports after booting PC.
> 
> But,
> (i) After apache2 starts by booting my PC, apache2 listens only IPv4's 80 and 443 tcp ports.
> (ii) Then after I execute
> # /etc/init.d/apache2 restart,
> apache2 becomes normal, that is, apache2 becomes to listen only IPv6's 80 and 443 tcp ports.
> 
> I have repeated many times.
> But after booting, apache2 always listens only IPv4's 80 and 443 tcp ports.
> And after 
> # /etc/init.d/apache2 restart,
> apache2 always becomes normal.
> 
> Why this phenoma happens ?
> In what situations apache2 falls back to use IPv4's 80 and 443 tcp ports
> instead of IPv6's 80 and 443 tcp ports ?
> If I know these situations, I might let apache2 listen IPv6's 80 and 443 tcp ports after booting my PC, by repairing files, etc. of my PC.

Read this:

http://www.cyberciti.biz/faq/ipv6-apache-configuration-tutorial/

-- 
Stan