How-to disable ipv6 on Linux ?
Debian based
Edit /etc/default/grub and add option
GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1 ..."
Generate conf file and update
grub-mkconfig -o grub.cfg
update-grub
RedHat based
Edit /etc/sysconfig/grub and add option
GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1 ..."
grub2-update