Quick tip on how to disable IPv6 from Raspberry Raspbian and RHEL-like distributions:
Raspbian
Open (or create) /boot/cmdline.txt file and add the following line:
ipv6.disable=1
Reboot your Rasp and it is done.
RHEL (RHEL, CentOS, Fedora, …)
Open /etc/default/grub file and add the ipv6.disable=1 parameter to the end of GRUB_CMDLINE_LINUX:
GRUB_CMDLINE_LINUX="rhgb quiet ipv6.disable=1"
Then you need to recreate the grub.cfg config file to reflect this new change.
If you are running on BIOS/Legacy mode:
1 | $ sudo grub2-mkconfig -o /boot/grub2/grub.cfg |
If you are running on UEFI mode:
1 | $ sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg |
Reboot your machine for this change to take effect.