Disable IPv6 by default.

[Jochen Schlick]

Chuck Anderson wrote:
> On Fri, Sep 14, 2007 at 10:25:31AM +0200, Laurent Rineau wrote:
>> On Thursday 13 September 2007 21:12:54 Chris Adams wrote:
>>> My main problem is that I configure IPv4 and I explicitly have IPv6
>>> turned off (or so it appears in the interface), yet I still have IPv6
>>> loaded and used.  This causes annoying warnings from programs trying to
>>> use an unconfigured IPv6 interface.
>>>
>>> If I don't configure IPv4, the interface isn't configured; why is it
>>> that way with IPv6?  If I don't configure anything for IPv6, it is still
>>> loaded.
>> It is the way of doing for a end-user machin, in IPv6: you do not need to 
>> configure your IPv6 parameters. If an IPv6-enabled router exists in your 
>> local network, it will broadcast the needed configuration. In a sens IPv6 is 
>> more "plug and play" than IPv4. For that mecanism to work, IPv6 interfaces 
>> are always up.
> 
> Recent OSes including Fedora do configure IPv4 automatically too.  
> You'll see 169.254.x.x addresses appear if there is no DHCP server 
> response.
> 

And the first step after every Fedora installation is always to disable
this microsoft feature and potential security hole.

  /etc/sysconfig/network
NOZEROCONF=yes

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Jochen Schlick