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In some situations, we may need to disable the IPv6 on the server. Here I am providing the steps to do it on Centos servers. You can watch the video tutorial by clicking here.

1. Open /etc/sysconfig/network file.

   # vi /etc/sysconfig/network 

2. Add the following line at the bottom or if it already exists, edit it like the following:

   NETWORKING_IPV6=no

3. Save and exit the file.
4. Open /etc/sysconfig/network-scripts/ifcfg-eth0 file(if the interface is configured with eth1 or any others, change the name accordingly).

   # vi /etc/sysconfig/network-scripts/ifcfg-eth0

5. Add the following line at the bottom of the file or if it already exists, edit it like the following:

   IPV6INIT=”no”

6. Save and exit the file.
7. Restart the network service:

   # service network restart