How to disable ipv6

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Hi all,

I'm pretty new to CentOS. I am working with a newly set-up server:

[cbearden@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@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
-- 
Chuck Bearden
Programmer Analyst IV
The University of Texas Health Science Center at Houston
School of Biomedical Informatics
Email: Charles.F.Bearden@xxxxxxxxxxx
Phone: 713.500.9672

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