We can easily disable IPv6 on Ubuntu using the GRUB command line with these steps in this article. At Bobcares, with our Server Management Service, we can handle your issues.

How to Disable IPv6 on Ubuntu using the GRUB Command Line?

IPv6 is the latest Internet Protocol version, used for identifying and locating computers on networks and routing traffic. Disabling IPv6 on Ubuntu may be necessary due to many issues. This includes compatibility issues with legacy systems, network config simplicity, security concerns, easier troubleshooting, or lack of necessity in certain environments.

We can do this temporarily using sysctl commands. Else, permanently by modifying system config files such as /etc/sysctl.conf and the GRUB config. Verifying the changes ensures that IPv6 addresses are no longer assigned to network interfaces. While disabling IPv6 can streamline network management and troubleshooting, it is important to consider the potential long-term benefits of IPv6 adoption as it continues to grow in usage and support across various platforms and services.

The steps to Disable IPv6 is as follows:

1. Check Current IPv6 config by opening a terminal and running:

ip -6 addr show

If we see “inet6” entries, IPv6 is enabled. If not, it’s disabled.

2. Now, open the GRUB config file to edit it:

sudo nano /etc/default/grub

3. Find these lines:

GRUB_CMDLINE_LINUX_DEFAULT=""
GRUB_CMDLINE_LINUX=""

4. We must change them to disable IPv6:

GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1"
GRUB_CMDLINE_LINUX="ipv6.disable=1"

5. Else, if we want to keep the “quiet splash” settings:

GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1 quiet splash"
GRUB_CMDLINE_LINUX="ipv6.disable=1"

6. Save and close the file (Ctrl+O, Enter, Ctrl+X).

7. Update GRUB and apply changes:

sudo update-grub

8. Restart the computer:

sudo reboot

By following these steps, we can disable IPv6 during the boot process on the Ubuntu system.

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Conclusion

While disabling IPv6 can simplify network management and troubleshooting in some environments, it is important to consider the potential long-term impacts. To sum up, our Support team went over the IPv6 disabling details.