Network connectivity Challenge with Multiple VPN Clients Connecting to Azure

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Hello Everyone.

I have encountered a network configuration challenge that requires your expertise. Here’s the scenario: I have two VPN clients, each situated in different geographical locations, both connecting to a VPN server hosted on Microsoft Azure.

Client 1: This is a Linux-based device configured to support both OpenVPN and L2TP/IPsec as a client.

Client 2: Operates on a Windows 10 PC

The primary objective I aim to achieve is to enable Client 2, when connected to the VPN server in Azure, to access the entire network associated with Client 1.

I’ve made attempts to address this challenge by forwarding all traffic from the ‘eth0’ interface of the Linux device to the ‘tun/tap’ virtual adapter. However I didn’t find much success with this method.

Currently, my VPN setup involves using SoftEther as the server, hosted on Azure. Client 1 connects via OpenVPN, while Client 2 uses the SoftEther client. I am open to considering alternative VPN server options or methods if they can help resolve this issue.

Given my limited experience in this domain, I kindly request a comprehensive explanation of any potential solutions. If further details are required to better understand the problem, please do not hesitate to let me know.

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See https://community.openvpn.net/openvpn/wiki/RoutedLans

Make sure that there is no overlap in IP addresses. When taking your networks in their entirety, every single IP address has to be unique.

If you hit a wall, post all networking routes from all devices involved, as well as ping reports (A → B works, B → C doesn’t, etc.) and firewall rules in a human-readable format.