Contents

Introduction

Prerequisites

Requirements

Configure

Configurations

Verify

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