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Issue with communication between VPN clients via Ewon Flexy 201 and OpenVPN server on - Printable Version

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Issue with communication between VPN clients via Ewon Flexy 201 and OpenVPN server on - JTalbourdet - 10-12-2024

Hello,
I followed the official application note to connect my Ewon Flexy 201 to an OpenVPN server running on pfSense. The Ewon and two other clients can successfully connect to the VPN server, but I am experiencing an issue with communication between certain clients.
Here are my observations:
  • The server (10.8.0.1) can ping my PC (10.8.0.2): OK.
  • My PC (10.8.0.2) can ping another client (10.8.0.4): OK.
  • My PC (10.8.0.2) cannot ping the Ewon client (10.8.0.3): Fail.
  • The server (10.8.0.1) cannot ping the Ewon client (10.8.0.3): Fail.
What I have checked:
  1. VPN connection: The VPN client on the Flexy is connected, and pfSense correctly assigns it the IP address (10.8.0.3).
  2. Ping from the server: The VPN server (10.8.0.1) cannot reach the Ewon client (10.8.0.3), suggesting that the Ewon does not respond to ICMP requests, or they are blocked.
  3. Firewall on pfSense: I have not found any rules blocking communication between VPN clients.
  4. Ping between other clients: Other VPN clients can communicate with each other without issues.
Hypotheses:
  1. The VPN client on the Ewon blocks ICMP requests from the other clients and the server.
  2. There is an OpenVPN or pfSense configuration issue preventing communication between the server/other clients and the Ewon.
  3. A routing or network setting on the Flexy 201 is blocking ICMP responses.
Do you have any suggestions or specific points to check in the Flexy configuration to resolve this issue?
Thank you in advance for your help!

RE: Issue with communication between VPN clients via Ewon Flexy 201 and OpenVPN server on - simon - 12-12-2024

Hi,

There is an option to allow "Client-to-client" communication in OpenVPN and in pfsense.
I have checked on my Anybus defender (which uses pfsense) and the option is called : Inter-client communication : Allow communication between clients connected to this server