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4.4.16. Disable IPv6 on VPS

In Linux-like operating systems, you can disable IPv6 both for all interfaces and for a specific one. There are generic methods that can be applied to all operating systems.

Disable IPv6 for all interfaces
Disable IPv6 for a Specific Interface

To disable IPv6 for all interfaces, do the following:

Go to directory /etc/sysctl.d/:
```
cd /etc/sysctl.d/
```
Add to file 99-sysctl.conf the necessary parameters to disable IPv6, which can be done in several ways:
- By editing the file manually using any convenient editor:
```
vi 99-sysctl.conf
```
  You need to add the following lines to the end of the file:
```
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
```
- Having inserted the necessary lines at the end of the file using the command:
```
printf "\n net.ipv6.conf.all.disable_ipv6 = 1 \n net.ipv6.conf.default.disable_ipv6 = 1" >> 99-sysctl.conf
```
Apply the changes by running the command:
```
sysctl -p 
```
Check that there is no IPv6 configured on the server by running the command:
```
ifconfig
```

To disable IPv6 for a specific interface, do the following:

Determine for which interface you want to disable IPv6. You can list all interfaces using the command:
```
ifconfig
```
- The command output will look something like this:For example, the desired interface will be called eth0.
Go to directory /etc/sysctl.d/:
```
cd /etc/sysctl.d/
```
Add to file 99-sysctl.conf the necessary parameters to disable IPv6, which can be done in several ways:
- By editing the file manually using any convenient editor:
```
vi 99-sysctl.conf
```
  At the end of the file you need to add a line:
```
net.ipv6.conf.eth0.disable_ipv6 = 1
```
  Instead eth0 specify the interface you want.
- By inserting the required line at the end of the file using the command:
```
printf "\n net.ipv6.conf.eth0.disable_ipv6 = 1" >> 99-sysctl.conf
```
  Instead eth0 specify the interface you want.
Apply the changes by running the command:
```
sysctl -p 
```
Check that there is no IPv6 configured on the server by running the command:
```
ifconfig
```