How to disable ipv6 in Linux

IPv6 (Internet Protocol version 6) is a new generation network protocol on the Internet. It aims to solve the challenge of IPv4 address exhaustion and provide a broader address space for the rapid growth of the Internet in the future. IPv6 uses a 128-bit address length. Compared with the 32-bit IPv4, IPv6 has far more assignable addresses, providing more sufficient IP address resources for connecting IoT devices, smart homes, mobile devices, etc. This transformation will not only allow more devices to access the Internet, but also improve the efficiency and security of the network. The gradual rollout of IPv6 will facilitate

However, in some cases, disabling IPv6 may also be necessary, such as when IPv6 is unavailable or unsafe in a specific network environment.

This article will introduce how to disable IPv6 in Linux systems.

Method 1: Disable IPv6 through sysctl configuration

In Linux systems, we can dynamically configure kernel parameters through the sysctl tool.

If you want to disable IPv6, you can do so by modifying the sysctl configuration.

1. Open the terminal and log in with root privileges.

2. Use a text editor to open the /etc/sysctl.conf file.

sudo nano /etc/sysctl.conf

3. Add the following content at the end of the file:

# 禁用IPv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1

4. Save and close the file. Then run the following command for the changes to take effect:

sudo sysctl -p

5. Check whether IPv6 is disabled. Run the following command:

cat /proc/sys/net/ipv6/conf/all/disable_ipv6

If the output is 1, it means IPv6 has been successfully disabled.

Method 2: Temporarily disable IPv6

In addition to permanently disabling IPv6 via sysctl, IPv6 can also be temporarily disabled without affecting the permanent configuration.

1. Open the terminal and log in with root privileges.

2. Run the following command to temporarily disable IPv6:

sudo sysctl -w net.ipv6.conf.all.disable_ipv6=1
sudo sysctl -w net.ipv6.conf.default.disable_ipv6=1

3. To re-enable IPv6, you can run the following command:

sudo sysctl -w net.ipv6.conf.all.disable_ipv6=0
sudo sysctl -w net.ipv6.conf.default.disable_ipv6=0

This will disable IPv6 immediately, but will restore it to the default configuration after rebooting the system.

Method 3: Disable IPv6 module

Another method is to directly disable the IPv6 module in the Linux kernel. This method completely disables IPv6 regardless of how the system is configured.

1. Open the terminal and log in with root privileges.

2. Run the following command to disable the IPv6 module:

sudo echo "blacklist ipv6" >> /etc/modprobe.d/blacklist.conf

3. Restart the system for the changes to take effect.

in conclusion

Through the methods introduced above, I believe you can easily disable IPv6 in your Linux system.

You can choose to permanently disable IPv6, temporarily disable IPv6 or disable the IPv6 module according to your own needs.

However, you must operate with caution to avoid unnecessary network problems.

• Method 1: Disabling IPv6 through sysctl configuration is a permanent disabling method, suitable for situations where IPv6 needs to be disabled at the system level.
• Method 2: Temporarily disabling IPv6 allows you to temporarily disable IPv6 without affecting the permanent configuration, which is suitable for temporary needs in specific scenarios.
• Method 3: Disabling the IPv6 module can completely disable the IPv6 function, but it may affect the normal operation of applications or services that rely on IPv6, so you need to consider it carefully when using it.

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