what is the F19 way to disable ipv6?

["Jóhann B. Guðmundsson"]

On 07/15/2013 02:44 PM, Michal Schmidt wrote:
> On 07/13/2013 01:44 AM, Reindl Harald wrote:
>> please take a look at this
>> https://bugzilla.redhat.com/show_bug.cgi?id=982740#c12
>>
>> what do we do in the future to disable ipv6 entirely
>> and why is "ipv6.disable=1" as kernel param at least
>> with 3.10.0-1.fc20.x86_64 on F19?
>
> Back in 2011 the preferred kernel parameter to do that was 
> "ipv6.disable_ipv6=1":
> https://lists.fedoraproject.org/pipermail/kernel/2011-June/003106.html
> I assume it's still true today.
>
> "ipv6.disable=1" should still work though. I still see it handled 
> net/ipv6/af_inet6.c.
>
> In the linked Bugzilla comment you mentioned "ipv6disable=1" (without 
> a dot). Did this ever work? I think it's a typo.
>

Adding |ipv6.disable=1| to the kernel commandline disables the whole 
IPv6 stack
||
Adding |ipv6.disable_ipv6=1| will keep the IPv6 stack functional but 
will not assign IPv6 addresses to any of your network devices.

Creating and adding to for example /etc/sysctl.d/ipv6.conf will avoid 
assigning IPv6 addresses to spesific network interface
# Disable IPv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.<interface0>.disable_ipv6 = 1

However disabling IPv6 functionality in the kernel will not necessary 
prevent other programs from trying to use IPv6 like for example dhcpd 
which requires to add "noipv6rs" to /etc/dhcpd.conf so one needs to 
consult the man pages for relevant program on how to disable it.

JBG