User Documentation

Version 1.2 / August 2020 Page 51 / 102

Function

The OpenVPN menu allows to create and establish virtual private network connections

based on the Open-VPN implementation. The Router can be configured both as OpenVPN

client and OpenVPN server either based on Layer 2 (Bridging) or on Layer 3 (Routing). A

maximum of 10 OpenVPN connections (either as client or as server) can be configured and

started at the same time. Each VPN connection can be configured individually at Tab’s

VPN1…VPN10.

Note: OpenVPN connections can only be used with encryption based on certificates.

On each configured OpenVPN server connection theoretically any number of remote Open-

VPN clients can be connected (only limited by the hardware performance of the Router).

After configuration of OpenVPN sessions the configured connected will be displayed at a

glance in this menu.

VPN LED/output controller

Disabled: The LED and digital output are not used by u-link

u-link: LED is blinking during connecting and on during con-

nection, digital output is triggered by u-link

Polarity of digital input

(VPN initiate)

rising edge: VPN is triggered by rising edge of input voltage

(from 0 V to 24 V)

falling edge VPN is triggered by falling edge of input voltage

(from 24 V to 0 V)

VPN→ OpenVPN (Tab VPN1)

Configuration → VPN → OpenVPN → Tab „VPN1“

Function

Screenshot of a configured OpenVPN-Client at tab VPN1

Enable VPN

instance

Activates this OpenVPN connection

Interface Mode

Select the connection mode which is either Server or Client

Server: The device will run a TCP/UDP server which numerous clients can

connect to

Client: The device will establish a connection to an OpenVPN server

Permanent

connection

If enabled on a server instance the server will always be up. In enabled on

a client instance, the client will try to connect if the connection gets lost. If

not enabled the connection can be switched on using the VPN key, CUT

or ALARM triggers, Modbus TCP or API.

Configuration of OpenVPN connections

on tabs VPN2 …VPN10 are the same as

for tab VPN1.