Software & AppsOperating SystemLinux

How To Disconnect from OpenVPN

Ubuntu 14

In the world of virtual private networks (VPNs), OpenVPN stands out as a popular and widely-used solution. It offers a high level of security and flexibility, making it the go-to choice for many businesses and individual users. However, disconnecting from an OpenVPN connection can sometimes be a challenge, particularly for users who are new to the system. In this article, we will provide a detailed guide on how to disconnect from OpenVPN using different methods.

Method 1: Using the sudo killall openvpn Command

One of the simplest ways to disconnect from OpenVPN is by using the sudo killall openvpn command. This command effectively kills all running OpenVPN processes, which in turn disconnects you from the VPN.

sudo killall openvpn

The killall command is a powerful tool that sends a signal to terminate a process. In this case, the process is openvpn. The sudo command is used to execute the command with root privileges, which is often necessary when dealing with system processes.

Please note that this method may require installing the psmisc package on some builds.

Method 2: Using the openvpn3 session-manage Command

For users running OpenVPN version 3, the openvpn3 session-manage command can be used to disconnect a specific session. This is particularly useful if you have multiple VPN connections and only want to disconnect from one of them.

First, you need to list all active sessions using the openvpn3 sessions-list command:

openvpn3 sessions-list

This command will display a list of all active OpenVPN sessions, each with a unique session path. You can then use the session path to disconnect from a specific session:

openvpn3 session-manage --disconnect --session-path <session_path>

Replace <session_path> with the actual session path from the list.

Method 3: Using the sudo ifconfig tun0 down Command

Another method to disconnect from OpenVPN involves bringing down the virtual interface tun0, which is commonly used by OpenVPN. This can be achieved using the sudo ifconfig tun0 down command:

sudo ifconfig tun0 down

The ifconfig command is used to configure network interfaces. In this case, tun0 is the network interface, and down is the command to disable it.

Method 4: Using the sudo ip link delete tun0 Command

If the tun0 interface remains open even after stopping OpenVPN, you can delete it using the sudo ip link delete tun0 command:

sudo ip link delete tun0

The ip command is a powerful tool for managing network interfaces. The link delete command is used to delete a network interface, in this case, tun0.

Method 5: Using a Combined Command to Disconnect All Sessions

If you have multiple active sessions and want to disconnect from all of them, you can use a combined command that lists all active sessions and disconnects them one by one:

sudo openvpn3 sessions-list | grep -ioP '/net/openvpn/v3/sessions/\w+' | xargs -I{} sudo openvpn3 session-manage --path {} --disconnect

This command uses the openvpn3 session-manage --disconnect --session-path <session_path> command internally to disconnect each session.

Conclusion

Disconnecting from OpenVPN can be achieved in several ways, and the method you choose largely depends on your specific needs and the OpenVPN version you are using. Remember to replace <session_path> with the actual session path when using the openvpn3 session-manage command. Always exercise caution when using sudo commands, as they have the power to make significant changes to your system.

How do I know if I am connected to an OpenVPN server?

To check if you are connected to an OpenVPN server, you can use the ifconfig command and look for the tun0 interface. If it is present, it means you are connected to an OpenVPN server.

Can I disconnect from OpenVPN without using any commands?

Yes, if you are using a graphical user interface (GUI) OpenVPN client, you can usually disconnect by clicking on a "Disconnect" or similar button in the client interface. However, if you are using the command line interface (CLI), you will need to use the commands mentioned in this article.

Will disconnecting from OpenVPN affect my internet connection?

Yes, disconnecting from OpenVPN will restore your normal internet connection. When connected to OpenVPN, your internet traffic is routed through the VPN server. Disconnecting will revert your traffic back to your regular internet connection.

Can I reconnect to OpenVPN after disconnecting?

Yes, you can reconnect to OpenVPN after disconnecting by using the appropriate commands or by restarting your OpenVPN client. Simply follow the connection steps you used initially to establish the VPN connection.

What should I do if I encounter any errors while disconnecting from OpenVPN?

If you encounter errors while disconnecting from OpenVPN, you can try restarting your computer and attempting the disconnection again. If the issue persists, you may need to seek assistance from your network administrator or consult the OpenVPN documentation for troubleshooting steps specific to your situation.

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