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How to disable IPv6 on Linux?

Red Hat-based system

Here's how to disable the protocol on a Red Hat-based system:

  1. Open a terminal window.
  2. Change to the root user.
  3. Issue the commands: 
  • sysctl -w net.ipv6.conf.all.disable_ipv6=1
  • sysctl -w net.ipv6.conf.default.disable_ipv6=1
  • sysctl -w net.ipv6.conf.tun0.disable_ipv6=1

To re-enable IPv6, issue the following commands:

  • sysctl -w net.ipv6.conf.all.disable_ipv6=0
  • sysctl -w net.ipv6.conf.default.disable_ipv6=0
  • sysctl -w net.ipv6.conf.tun0.disable_ipv6=0
  • sysctl -p

Debian based distributions

Here's how to disable the protocol on a Debian-based machine.

1. Open a terminal window.

2. Issue the command 

  • sudo nano /etc/sysctl.conf

3. Add the following at the bottom of the file:

  • net.ipv6.conf.all.disable_ipv6 = 1
  • net.ipv6.conf.default.disable_ipv6 = 1
  • net.ipv6.conf.lo.disable_ipv6 = 1
  • net.ipv6.conf.tun0.disable_ipv6 = 1

4. Save and close the file.

5. Reboot the machine.

To re-enable IPv6, remove the above lines from /etc/sysctl.conf and reboot the machine.

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