IPv6 for Linux
From KlavoWiki
To Disbale IPv6 for Linux:
CentOS 7.x
vi /etc/sysctl.conf
Add the line
net.ipv6.conf.all.disable_ipv6 = 1
Activate the changes without a reboot
sysctl -p
CentOS 6.x
vi /etc/sysconfig/network
NETWORKING_IPV6=no
vi /etc/modprobe.conf
alias net-pf-10 off alias ipv6 off
Stop the ipv6tables service
service ip6tables stop chkconfig ip6tables off