• Security Analytics 10.x

• Due to PCI DSS standards, some customers need to disable IPv6 if not used.
• This technique disables IPv6 on interfaces, without the need of disable kernel modules that might overlap.
• Please make sure that you really do not need IPv6 to communicate with any other devices before attempting this.

• Login to your machine as root user.
• Open the file   /etc/sysctl.conf  using "vi" or any text editor.
• Add/edit this line.

net.ipv6.conf.eth0.disable_ipv6 = 1

• Make sure to replace "eth0" with the network card in question.
• Save and exit.
• Finally

  # sysctl -p

  
  to push configuration then restart network services.

• Please make sure that you really do not need IPv6 to communicate with any other devices before attempting this.
• Please make sure you are running EL6, to check this you can run the below command and make sure result is 6.x

# cat /etc/centos-release
CentOS release 6.7 (Final)