How to Disable IPV6 from CentOS / Linux

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Updated:August 21, 2017
Document ID:212155

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Introduction

This document drescribe how to disable IPV6 from Linux Operator System.

Contributed by Gustavo Bell, Cisco TAC Engineer.

Prerequisites

Requirements

- Access as root user to the system.

- OS (Operation System)

Configure

Configurations

Step 1. Connect to OS as root

Step 2. Verify the if the system have an IPV6 ip.

ip add | grep inet6

possible output 

    inet6 ::1/128 scope host
    inet6 fe80::18e2:36ec:dd69:6c3f/64 scope link

Step 3. Modify the file /etc/sysctl.conf and add the following lines/ 

echo "net.ipv6.conf.eth0.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.default.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.lo.disable_ipv6 = 1" >> /etc/sysctl.conf

Step 4. Reboot the system

systemctl reboot

Verify

Step 1. Verify if PV6 is running. The output should empty 

ip add | grep inet6

TAC Authored

Contributed by Cisco Engineers

  • Gustavo Bell
    Cloud Center

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