Centos 关闭IPV6 全面方法
网上大家都在传这个信息，可是很多时候都关不掉只得重装。到官网上看到全面的方法。有效！

vi /etc.sysconfig/networkt

     NETWORKING_IPV6 no

vi /etc/modprobe.conf

alias ipv6 off
alias net-pf-10 off
options ipv6 disable=1特别是红色部份。关他呢，全加上。reboot 后，ip6 真的去掉了。

Edit /etc/sysconfig/network and set "NETWORKING_IPV6" to "no"
For 5.4 and later, replace in /etc/modprobe.conf
 

alias ipv6 off
 

by

options ipv6 disable=1
 

Alternative (which might be easier and works on any release with /etc/modprobe.d):

# touch /etc/modprobe.d/disable-ipv6.conf
# echo "install ipv6 /bin/true" >> /etc/modprobe.d/disable-ipv6.conf 

For CentOS 5.3 or older, add the following to /etc/modprobe.conf :
 

alias ipv6 off
alias net-pf-10 off
 

Run /sbin/chkconfig ip6tables off to disable the IPv6 firewall

Reboot the system