[CentOS] How to disable ipv6

Johnny Hughes johnny at centos.org
Wed Nov 28 18:45:02 UTC 2012


On 11/28/2012 12:25 PM, Charles Bearden wrote:
> Hi all,
>
> I'm pretty new to CentOS. I am working with a newly set-up server:
>
> [cbearden at host ~]$ lsb_release -a
> LSB Version: 
> :core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
> Distributor ID:	CentOS
> Description:	CentOS release 6.3 (Final)
> Release:	6.3
> Codename:	Final
>
> I'm trying to solve this problem (X11 forwarding)
>    http://thread.gmane.org/gmane.linux.centos.general/119342/focus=119347
> for myself.
>
> But disabling ipv6 and adding
>
>    AddressFamily inet
>
> to my sshd config didn't fix the problem. Oddly enough, the output of
>
>    netstat -an
>
> suggests that ipv6 is still enabled:
>
>    tcp        0      0 :::22                       :::*                   LISTEN
>
> even though
>
>    [cbearden at PostgreSQL ~]$ cat /proc/sys/net/ipv6/conf/all/disable_ipv6
>    1
>
> This is after a reboot. Am I right that the /proc file suggests that ipv6 is 
> disabled while netstat suggests that it isn't?
>
> Thanks,
> Chuck

http://wiki.centos.org/FAQ/CentOS6#head-d47139912868bcb9d754441ecb6a8a10d41781df

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