To set up mutual client communication between two VPN clients using vnpd,follow these steps:

1. Connect to the Main VPN:

   vnpd -i 192.168.1.1 -c client_name -o main_client

   Replace client_name with the IP address of the client you want to monitor and -o main_client to assign the main client name.

2. Set Mutual Communication:

   vnpd -s -t -k -c another_ip -o another_client

   Replace another_ip with the IP address of the other client and another_client with the name you want for the other client.

3. Verify Connection:

   vnpd -check

Notes:

• Use the test string -t instead of the IP address for authentication.
• The test string is used to verify authentication and security settings.
• After a successful connection, you can check periodically in the main client by entering vnpd -check.

Considerations:

• Mutual communication is useful for ensuring both clients are secure and functional together but does not guarantee one client's security if the other is compromised.
• Test the command on your local network to ensure it works.

This method allows you to verify the connection and mutual communication between two VPN clients efficiently.