Last updated on November 28, 2020 by Dan Nanni
There are many ways to set up a VPN. Setting up a VPN typically requires using privileged access on all hosts involved (in order to create virtual network interfaces via
tap devices), as well as opening up additional VPN ports on any existing firewall. This is an administrative overhead. If you can configure a VPN over a commonly available SSH tunnel, it will reduce the VPN provisioning overhead.
In this tutorial, I will describe how to set up a VPN over SSH in Linux, by using a command-line tool called
sshuttle is originally developed as a transparent proxy server, but it can work as a VPN over SSH.
To be able to create a VPN through SSH with
sshuttle, you only need to install
sshuttle on local host. You do not need to install
sshuttle nor require root access on the other remote host. Upon VPN creation, the
sshuttle's python code on local host will automatically be uploaded to the remote host for running without root access. The only requirements for the remote host are that SSH server be running, and that
python interpreter be installed.
sshuttleon Ubuntu or Debian
$ sudo apt-get install sshuttle
sshuttle on CentOS, Fedora or RHEL
First, download its python code from its official repository, and include the downloaded
sshuttle in your PATH environment variable.
$ sudo yum install git $ git clone git://github.com/apenwarr/sshuttle
To initiate a VPN connection through SSH tunnel with
sshuttle, run the following command.
$ sudo sshuttle -r [email protected]_host 0.0.0.0/0 --dns
[email protected]_host's password: ####### Connected.
As you can see above,
sshuttle will ask you for SSH password to the remote host. If you see
Connected message after logging in, this means that a VPN is successfully established over SSH.
0.0.0.0/0 means that all traffic will be forwarded to, and routed via the remote SSH host.
--dns option makes local DNS requests be forward to the remote host as well.
At this point, you should be able to access any external host via a remote SSH host. To tear down an existing VPN over SSH, simply press
Ctrl+c on the terminal where
sshuttle is running.
If you want only specific subnets to be routed over the VPN, you can specify such subnets when launching
sshuttle as follows.
$ sudo sshuttle -r [email protected]_host 18.104.22.168/16 22.214.171.124/16
As clarified in the beginning, the remote host must have
python installed. If
python is not available on the remote host, you will see the following error when running
P=python2: Command not found. P: Undefined variable. client: fatal: server died with error code 1
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