[CentOS] How to disable ipv6
Charles.F.Bearden at uth.tmc.edu
Wed Nov 28 20:11:58 UTC 2012
On 11/28/2012 12:45 PM, Johnny Hughes wrote:
> 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:
>> Distributor ID: CentOS
>> Description: CentOS release 6.3 (Final)
>> Release: 6.3
>> Codename: Final
>> I'm trying to solve this problem (X11 forwarding)
>> 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
>> 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 to Mark, Barry, and Johnny for their swift responses.
I tried the steps at the wiki page above, but no joy. In particular, when I
restart sshd, it appears that the 'stop' part fails:
# /etc/init.d/sshd restart
Stopping sshd: [FAILED]
Starting sshd: [ OK ]
Despite altering both values via sysctl and adding the AddressFamily line and
uncommenting ListenAddress 0.0.0.0, sshd appears still to be listening on :::22.
Other processes are still listening on ipv6-bound ports as well.
Do I need to explicitly remove the ipv6 kernel module? I probably can't while
some daemons are bound to ::: ports. Sorry if I'm being dense here.
I don't know if this makes any difference, but the CentOS system is running in a
VM. It's not a setup I chose or ultimately control.
Programmer Analyst IV
The University of Texas Health Science Center at Houston
School of Biomedical Informatics
Email: Charles.F.Bearden at uth.tmc.edu
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