Disable ipv6 in Centos 5.x , RHEL & Fedora

By default the ipv6 module is turned on during the installation, you can turn off the module or install/configure the ip6tables tables to prevent your server from attacks.
Steps to disable the ipv6 module.
Edit the file /etc/modprobe.conf in your favorite editor and add the lines below.
alias net-pf-10 off
alias ipv6 off
Edit the /etc/sysconfig/network file
Change to
Disable the ipv6 firewall by :
service ip6tables stop

chkconfig ip6tables off
Restart your server and make sure that inet6 addr: is not listing any ipv6 ips in the ifconfig after reboot.

Privacy Preferences
When you visit our website, it may store information through your browser from specific services, usually in form of cookies. Here you can change your privacy preferences. Please note that blocking some types of cookies may impact your experience on our website and the services we offer.