WiFi and LTE failover with the same IP

[robert1]

Hello Support team,

I’m currently testing WiFi and LTE failover with the RUT956.
The configuration is as follows.
PC1-AP - - - - - Client (RUT956)-PC2

However, the most important point here is that I want each PC on the AP and client side to communicate with the same IP address without changing the IP address.

I have two questions:

1. Is end-to-end VPN communication (OpenVPN) required?
2. Is this feasible with the RUT956? If so, I need detailed setup instructions.

Your insightful opinions are very helpful to me.

Best Regards,
Robert.

[Justinas]

Greetings,

Could you please provide a detailed network topology with the corresponding IP addresses so we can better understand your intended setup and use case.

Best Regards,
Justinas

[robert1]

Dear Justinas,

My Intended Use Case

I am testing WiFi and LTE Auto-Failover using RUT956.

The configuration is as follows:

PC1 ←→ AP (ACKSYS) ←→ Internet ←→ RUT956 (Client) ←→ PC2

In this setup, the field device (client: RUT956) should:

Use the WiFi connection whenever available (preferred path) and

Automatically switch to LTE when WiFi becomes unavailable or its signal quality drops,

all while keeping the same logical IP address through the VPN tunnel.

This means that even during WiFi ↔ LTE transitions, the connection between PC1 and PC2 should remain under one consistent tunnel IP address (e.g. 10.8.0.2).

Technical Objective

To achieve this, I plan to establish a site-to-site VPN tunnel (OpenVPN) between:

The ACKSYS industrial router acting as the VPN Server

The RUT956 acting as the VPN Client

This VPN tunnel should maintain a fixed internal IP for both ends, such as:

ACKSYS (Server): 10.8.0.1

RUT956 (Client): 10.8.0.2

Points to Confirm

Could you please provide detailed configuration guidance or documentation for:

• Setting up OpenVPN Client on the RUT956 for this behavior

• Implementing WiFi → LTE Auto-Failover

• Ensuring the VPN tunnel remains consistent with the same IP

I would appreciate any official examples and configuration steps for implementing this use case.

Thank you very much for your support.

Best regards,
Robert

[Justinas]

Greetings,

You can find an example of the OpenVPN client configuration here:

OpenVPN configuration examples - Teltonika Networks Wiki

Information on configuring failover is available at:

RUT956 Failover - Teltonika Networks Wiki

Please note that the VPN IP address will remain the same even when the internet source changes, and no additional configuration is required.

Best Regards,
Justinas