3 A Nagios plugin for checking whether or not an OpenVPN server is
6 We don't actually interact with the OpenVPN server; we merely send it
7 a a magic (heretofore unexplained) byte sequence and ensure that we
8 get some kind of response.
10 If the server uses a TLS auth key, the response will be empty but at
11 least it will come, preventing a timeout.
15 Perform a basic check using the default port and protocol:
17 $ check_openvpn-simple vpn1.example.com
20 Check a server that runs on TCP/443 (this is used to sneak past
21 firewalls that allow HTTPS but block other traffic):
23 $ check_openvpn-simple --tcp --port 443 vpn2.example.com