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To verify if IPv6 is enabled or not, execute
ifconfig -a | grep inet6
inet6 fe80::211:aff:fe6a:9de4 prefixlen 64 scopeid 0x20
inet6 ::1 prefixlen 128 scopeid 0x10[host]
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Disable Ipv6 in kernel module (requires reboot)
Edit /etc/default/grub
add ipv6.disable=1 in line GRUB_CMDLINE_LINUX, e.g
cat /etc/default/grub
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"
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Regenerate a GRUB configuration file and overwrite existing one
grub2-mkconfig -o /boot/grub2/grub.cfg
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Restart system and verify no line “inet6” in “ip addr show” command output
shutdown -r now