[CentOS] Ifconfig ipv6:permission denied.

Fri Sep 19 20:52:56 UTC 2014
Marcelo Ricardo Leitner <marcelo.leitner at gmail.com>

On 18-09-2014 13:57, James Hogarth wrote:
> On 18 Sep 2014 09:07, "dE" <de.techno at gmail.com> wrote:
>> On 09/17/14 21:03, Marcelo Ricardo Leitner wrote:
>>> One more test. Please check sysctl -a | grep disable_ipv6   output
>>> And if it's =1, set it to 0.
>>> When NetworkManager is running, it may disable ipv6 on the interface if
> its not configured via NM...
>> Yes, that was it. Thanks!!
>> But this's the default? The installer should be checked for this.
> The default is not to disable ipv6 so something in your environment
> actively did this.

Well... NM needs to put the interface UP so it can reliably monitor the 
link state. But that was turning ipv6 addr auto-config on and was 
considered a security issue and thus NM started disabling ipv6 on such 
(non-configured via NM but monitored) interface to avoid the address 
auto-configuration from happening, yet causing this.

The fix (to be able to bring it up without ipv6 address autoconfig) 
needed kernel & NM patches and show be available on 7.0.z very soon.

> This does, however, leave me somewhat confused as to how you claimed there
> was a fc00::1001 address on there and you were adding the additional
> address when you saw the refused message...

Such address was on the host, no?