How to disable IPv6 on Red Hat

Edit /etc/sysconfig/network and change

NETWORKING_IPV6=yes to

NETWORKING_IPV6=no

Edit /etc/modprobe.conf and add these lines (if they’re not in it):

alias net-pf-10 off

alias ipv6 off

Stop the ipv6tables service by typing:

service ip6tables stop

Disable the ipv6tables service by typing:

chkconfig ip6tables off

After these changes, IPv6 will be disabled after the next reboot of your system.