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Turn off IPv6 CentOS and CSF

Dustin  |  Programming & Scripting  |  September 5th 2010

If you are running csf on your CentOS server and run the server security check you may have seen the following message:

Check for IPv6: IPv6 appears to be enabled [ifconfig: ]. If ip6tables is installed, you should enable the csf IPv6 firewall (IPV6 in csf.conf). To disable IPv6 on RHEL/CentOS you should follow this link.

Upon following the link you end up at the login screen for access.redhat.com. Even after creating an account viewing the link requires a subscription. Seems a little odd that a subscription is required to find out how to disable IPv6…

So, here is how you do it:

  1. Log into the server as root
  2. Type in the following: 
    # touch /etc/modprobe.d/disable-ipv6
# echo "options ipv6 disable=1" >> /etc/modprobe.d/disable-ipv6

    Note: Slightly different prior to the 5.4 update. For more information on the above see this link on the centos wiki. Its a bit more helpful than the link provided in the csf notes.

  3. Restart the server
Dustin Czysz is a self-taught web developer & strategist from Wisconsin. In 2000 he left his day job to begin his freelance career and later founded Klovera, a web solutions business that focuses on custom development for web and mobile devices.
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