How to disable IPv6 in Linux systems

IPv6 and IPv4 belong to the same network protocol. In Linux systems, when IPv6 and IPv4 exist simultaneously, connection timeout may occur. In this case, you only need to disable IPv6 to solve this problem. The following is a small series. The way Linux disables IPv6.

IPv6 is considered to be IPv4—— an alternative to the traditional 32-bit address space —— on the Internet, which is used to solve the problem that the existing IPv4 address space is about to run out. However, since there are already a large number of hosts and devices connected to the Internet using IPv4, it is almost impossible to switch them all to IPv6 overnight. Many IPv4 to IPv6 translation mechanisms (eg, dual stacks, network tunnels, proxies) have been proposed to facilitate the adoption of IPv6, and many applications are being rewritten, as we have advocated, to increase IPv6. support. One thing to be sure is that IPv4 and IPv6 are bound to coexist in the foreseeable future.

Ideally, the transition to IPv6 should not be seen by the end user, but the IPv4/IPv6 hybrid environment sometimes exposes you to various inadvertent collisions between IPv4 and IPv6. The problem. For example, you will run into application timeouts, such as apt-get or ssh attempting to fail over an IPv6 connection, DNS server accidentally emptying IPv6 AAAA records, or your IPv6-capable device is not compatible with your Internet service provider. Legacy IPv4 networks, and so on.

Of course this doesn't mean you should blindly disable IPv6 on your Linux machine. Given the benefits of IPv6 promises, we will eventually embrace it as part of the community, but as part of the troubleshooting process for end users, if IPv6 is indeed the culprit, then you can try to shut it down.

Here are some tips for getting your part in Linux (for example, for a particular network interface) or disabling IPv6 all. These tips should apply to all major Linux distributions including Ubuntu, Debian, Linux Mint, CentOS, Fedora, RHEL, and Arch Linux.

See if IPv6 is enabled in Linux

All modern Linux distributions automatically enable IPv6 by default. To see if IPv6 is activated on your Linux, you can use the ifconfig or ip commands. If you see the output of <;inet6” after entering these commands, it means that your Linux system has IPv6 enabled.

$ ifconfig

$ ip addr

temporarily disable IPv6

If you want to temporarily turn off on your Linux system For IPv6, you can use the /proc file system. "Temporary" means that the changes we made to disable IPv6 will not be saved after the system is restarted. IPv6 will be enabled again after your Linux machine reboots.

To disable IPv6 for a particular network interface, use the following command:

$ sudo sh -c ‘echo 1 》 /proc/sys/net/ipv6/conf/“interface- Name"/disable_ipv6’

For example, disable IPv6 on the eth0 interface:

$ sudo sh -c ‘echo 1 》 /proc/sys/net/ipv6/conf/eth0/disable_ipv6 & rsquo;

to re-enable the eth0 interface IPv6:

$ sudo sh -c & lsquo; echo 0 "/proc /sys /net /ipv6 /conf /eth0 /disable_ipv6 & rsquo; < Br>

If you want to disable IPv6 for all interfaces of the entire system, including the loopback interface, use the following command:

$ sudo sh -c ‘echo 1 》 /proc/sys/net/ipv6/conf /all/disable_ipv6’

Permanently disable IPv6

The above method does not permanently disable IPv6. Once you restart the system, IPv6 will still be enabled. If you want to turn it off permanently, there are a few ways you can try it.

Method One

The first method is to make permanent changes to /proc through the /etc/sysctl.conf file.

In other words, open /etc/sysctl.conf with a text editor and add the following:

# Disable IPv6 for all interfaces of the entire system

net.ipv6 .conf.all.disable_ipv6 = 1

# Disable IPv6 for a specified interface (eg eth0, lo)

net.ipv6.conf.lo.disable_ipv6 = 1

net.ipv6.conf.eth0.disable_ipv6 = 1

To make these changes take effect in /etc/sysctl.conf, run the following command:

$ sudo sysctl -p /etc/sysctl .conf

Or reboot directly.
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