Configuring Proxmox and OpenVPN with /dev/net/tun devices

Configuring Proxmox OpenVPN with /dev/net/tun for LXC Debian running OpenVPN

Proxmox is an open-source server virtualization management solution based on QEMU/KVM and LXC. OpenVPN is a full-featured open-source SSL VPN solution that accommodates a wide range of configurations. In this article, we will discuss how to configure Proxmox OpenVPN with /dev/net/tun for LXC Debian running OpenVPN.

Prerequisites

Before we begin, make sure you have the following:

• A Proxmox server
• A Debian LXC container running OpenVPN

Configuring Proxmox OpenVPN

To configure Proxmox OpenVPN, follow these steps:

1. Log in to your Proxmox server.
2. Create a new OpenVPN container by clicking on the "Create VM" button.
3. Select "LXC" as the type of container, and then select the Debian template.
4. Configure the network settings for the container. Make sure to enable the "TAP device" option, and select "/dev/net/tun" as the TAP device.
5. Configure the storage settings for the container. You can use a local or remote storage, depending on your setup.
6. Configure the other settings for the container, such as the hostname, root password, and network settings.
7. Start the container and connect to it via SSH.

Configuring OpenVPN on the Debian Container

To configure OpenVPN on the Debian container, follow these steps:

1. Install OpenVPN by running the following command:

2. Create a new OpenVPN configuration file by copying the sample configuration file:

3. Unzip the configuration file:

4. Edit the configuration file:

Make sure to configure the following settings:

• ca, cert, and key: The CA, certificate, and key files for the OpenVPN server.
• dh: The Diffie-Hellman parameters file for the OpenVPN server.
• server: The server network configuration for the OpenVPN server.
• push: The settings to push to the OpenVPN clients.
• user and group: The user and group to run the OpenVPN server as.

5. Start the OpenVPN server:

6. Enable the OpenVPN server to start on boot:

Configuring Proxmox to Allow /dev/net/tun Devices

To configure Proxmox to allow /dev/net/tun devices, follow these steps:

1. Log in to your Proxmox server.
2. Edit the LXC container configuration file:

Replace XXX with the ID of your LXC container.

3. Add the following lines to the configuration file:

Make sure to replace XXX with the ID of your LXC container.

In this article, we have discussed how to configure Proxmox OpenVPN with /dev/net/tun for LXC Debian running OpenVPN. We have covered the following key concepts:

• Configuring Proxmox OpenVPN
• Configuring OpenVPN on the Debian container
• Configuring Proxmox to allow /dev/net/tun devices

References

• Proxmox OpenVPN Wiki
• OpenVPN Configuration Guide
• Debian LXC Wiki