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RHEL 6
## METHOD (1) : disable at the system parameters
echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.default.disable_ipv6 = 1" >> /etc/sysctl.conf
## activate by
sysctl -p
## METHOD (2) : Set in kernel running parameters
sysctl -w net.ipv6.conf.all.disable_ipv6=1
## confirm disabled
sysctl -a --pattern=net.ipv6.conf.*disable
## METHOD (3)
## create /etc/modprobe.d/ipv6.conf
echo "options ipv6 disable=1" > /etc/modprobe.d/ipv6.conf
## reboot
reboot
RHEL 7/8
## METHOD (1) : disable at the system parameters
echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.default.disable_ipv6 = 1" >> /etc/sysctl.conf
## activate by
sysctl -p
## METHOD (2) : Set in kernel running parameters
sysctl -w net.ipv6.conf.all.disable_ipv6=1
## confirm disabled
sysctl -a --pattern=net.ipv6.conf.*disable
## METHOD (3) - disable in kernel
## Edit /etc/default/grub and add ipv6.disable=1 in line GRUB_CMDLINE_LINUX,
## See the sample output below
cat /etc/default/grub
(command output)
GRUB_TIMEOUT=5
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="ipv6.disable=1 crashkernel=auto rhgb quiet"
GRUB_DISABLE_RECOVERY="true"
## Regenerate a GRUB configuration file and overwrite existing one:
grub2-mkconfig -o /boot/grub2/grub.cfg
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