Siemens LOGO! CMR2040 Operating Instructions Manual page 99

● Connection with BM via the tunnel
You can reach LOGO! BM directly via the configured IP address. e.g. 192.168.0.1. In this
case, the CMR serves as a router for the data exchange. To do this enter the CMR in the
BM as a router.
After checking the connection establishment you can monitor the BM (via the Web or a
mobile app) and configure it using LOGO!Soft Comfort.
Setting up an OpenVPN connection
Below you will find an overview of the steps for setting up an OpenVPN connection.
1. Configure and check the mobile wireless connection
2. Optional: Configure and check DynDNS
3. Generate the pre-shared key on the CMR or OpenVPN client.
If you generate the pre-shared key on the OpenVPN client, load it on the CMR (see
below).
4. On the CMR adapt the port and the inactivity monitoring time.
Make sure that the port on the partner (OpenVPN client) is enabled or that port
forwarding is enabled on the router to which the partner is connected.
5. Load the standard server configuration ("vpnpeer.conf") on the configuration PC and copy
it to the OpenVPN client.
If necessary, adapt the "vpnpeer.conf" file: IP address, DNS address, PSK in unified
format
6. Enable OpenVPN o the CMR
7. Enable the OpenVPN client and check the connection status in the WBM: "Security >
Overview", if applicable diagnostics buffer
OpenVPN-PSK
● Active
Select the option to enable secure communication via OpenVPN.
● Port number
Here you configure the number of the OpenVPN port of the CMR. As default the port is
preset with the number 1194.
● Inactivity monitoring time (s)
Time without frame traffic after which the CMR sends a keepalive frame to the OpenVPN
client.
This parameter is, for example, useful when the partner has a dynamic IP address and a
DNS name is used for it.
Range of values (seconds): 60...65535
LOGO! CMR2020, LOGO! CMR2040
Operating Instructions, 10/2016, C79000-G8976-C356-03
Configuration (WBM)
5.11 Security
99