# Overview

**duo_openvpn** - Duo two-factor authentication for OpenVPN

Duo provides simple two-factor authentication as a service via:

1.  Phone callback
2.  SMS-delivered one-time passcodes
3.  Duo mobile app to generate one-time passcodes
4.  Duo mobile app for smartphone push authentication
5.  Duo hardware token to generate one-time passcodes

# Usage

OpenVPN integration instructions: <http://www.duosecurity.com/docs/openvpn>

# Support

Report any bugs, feature requests, etc. to us directly:
<https://github.com/duosecurity/duo_openvpn/issues>

Have fun!

<http://www.duosecurity.com>