AlmaLinux Disable IPv6 | How-to Guide

Learn how to disable ipv6 in AlmaLinux from our experts. Our Server Management Support team is here to help you with your questions and concerns.

How to disable ipv6 in AlmaLinux

Today, our experts will take us through disabling IPv6 on AlmaLinux.

1. Before we begin, it is a good idea to ensure that our system is using IPv6 with the following command:

   $ ip a | grep inet6Copy Code
2. Now, we have to open the GURB settings file in a text editor with the following command:

   $ sudo vim /etc/default/grubCopy Code
3. Then, add the following line at the end:

   GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX ipv6.disable=1"Copy Code
4. Now, save the file and exit.
5. At this point, we have to generate a new GRUB file for the changes to take effect:

   $ sudo grub2-mkconfig -o /boot/grub2/grub.cfgCopy Code
6. Additionally, we have to generate an EFI GRUB configuration file for EFI systems as seen here:

   $ sudo grub2-mkconfig -o /boot/efi/EFI/almalinux/grub2.cfgCopy Code
7. Now, it is time to reboot our system and recheck if IPv6 is supported.

   $ ip a | grep inet6Copy Code

   If we do not get any output of the above command, it means that IPv6 is disabled.

Alternatively, we can also choose to disable IPv6 temporarily on AlmaLinux with the following steps:

1. First, open the  /etc/sysctl.conf file with this command:

   $ sudo vim /etc/sysctl.confCopy Code

2. Then, add the following lines to the file to disable IPv6 for all network adapters:

   net.ipv6.conf.all.disable_ipv6 = 1
   net.ipv6.conf.default.disable_ipv6 = 1Copy Code

3. Then, save the file and exit.
4. Finally, run the following command to apply the changes:

   $ sudo sysctl -pCopy Code

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Conclusion

In summary, our Support Techs demonstrated how to disable ipv6 in AlmaLinux.