=====RHEL7 Disable IPv6===== This has changed significantly from RHEL 6 Here ae the steps: * Edit /etc/default/grub and append ipv6.disable=1 to GRUB_CMDLINE_LINUX GRUB_CMDLINE_LINUX="rd.lvm.lv=rhel/swap crashkernel=auto rd.lvm.lv=rhel/root ipv6.disable=1" * Run the grub2-mkconfig command to regenerate the grub.cfg file: # grub2-mkconfig -o /boot/grub2/grub.cfg Alternatively, on UEFI systems, run the following: # grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg See the link at [[https://access.redhat.com/solutions/8709]]