Question

I'm hoping that i can get some assistance with this issue. I have the following setup using 2 x TRB140 gateways.
I have a PC connected to a TRB140 Gateway and onto the mobile network.
I have a 2nd PC running VMWare Workstation connected to a 2nd TRB140 Gateway and onto the mobile network.
I have 2 x Virtual Machines (VMs) running on the 2nd PC, VM1 is a Windows 2022 Server running DNS, VM2 is running CentOS (Linux)
The 2nd PC can connect to the first PC using RMS.
I have created an OpenVPN connection between the 2nd PC (running the OpenVPN server) and the 1st PC running the OpenVPN client which seems fine.
I need the 1st PC to be able to query the DNS Server (VM1) running on the 2nd PC through the VPN tunnel

My end goal is that I'd like the 1st and 2nd PCs to talk to each other as if they are both on the same lan segment  subnet using the same IP address range even though they are talking via the mobile network..

Is this even possible?

Any assistance would be greatly appreciated.

Regards

i have tried the configuration according to guide you linked still having problems with openvpn connection disconnecting and reconnection at what appear be random intervals attached troubleshooting file from each if are able get any indications as to the problem with them

Comments

Here is the picture.

Answer 1

Hello,

My end goal is that I'd like the 1st and 2nd PCs to talk to each other as if they are both on the same lan segment  subnet using the same IP address range even though they are talking via the mobile network..

This sounds like You should be using OpenVPN in TAP mode, which operates on the second layer. More information about it can be found here. Since this tunnel would be configured on your PCs, and not the routers, I will not be able to help much in the configuration department, however, it should be quite straightforward. This way the server and the clients will be in the same subnet.

In the future, it is planned that RMS VPN Hubs will also support OpenVPN TAP mode, however for now, only TUN is supported.

If you experience any issues with the TAP mode, it would also be possible to achieve your setup with only the RMS tunnel. Simply add the routes in the RMS VPN configuration to both devices' LAN networks, enable LAN forwarding on them both (make sure their LAN networks do not overlap!), and the clients of 1st TRB LAN should be able to reach the clients of the 2nd TRB LAN, including the DNS server.

Hope this helps!

Best regards,
Daumantas G.

Comments

Hi DaumantasG

I have it on a constant ping between the two endpoints. I'm not sure if ICMP traffic is enough for it to stay active. The drop outs are at random time intervals and it never stays connected for more than a few seconds.

The plan for this would be to use approx 60 TRB140's to connect 60 Windows 10 PC's to a DNS server from around the state to run a web based control server for the Win10 PC's.

Thank you

Andy

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Hello,

  

Just to clarify, .ovpn files are not used anywhere at the moment, all of the clients are the TRBs, correct?

Multiple clients using the same certificate could exhibit the same behavior, so make sure different clients are configured in RMS for each device. This could also indicate route-clashing or similar network issues, however, without having your exact topology layout I will not be able to identify these conflict points.

If that does not help, perhaps you could try deleting the VPN hub and re-adding all of the devices? I will also ask you to attach a screenshot of the Routes section of the VPN hub to your original question. It will only be visible to Teltonika moderators.

  

Best regards,
DaumantasG

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Hi

.ovpn files are installed. My mistake was using the same client for each device. I have now generated a Custom client for each device and now have constant ping connectivity with no dropouts. The routes screenshot is attached above. Thank you.

Andy

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They are both TRB140's. Now need to get the OpenVPN connection running on the CentOS VM.

Andy

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Hello,

Great to hear that the issue was solved.

Connecting on the CentOS should be as simple as installing the OpenVPN client and uploading the file from RMS. Once again, different clients need to be generated in RMS for each connection.

Best regards,
DaumantasG