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I'm new to Linux. I have set an OpenVPN server on one of my Raspberry Pi 4 running Raspbian system (PiVPN script). Then I set client OpenVPN on my other Raspberry Pi 4 (the first one server is at my parents' house abroad). I can easily connect both of them or my laptop or Android Smartphone and it all works fine.

Recently I have set the client one as a WiFi hotspot so I can connect many devices and get IP from the Raspberry server (get around the geographical restrictions). Once I start the VPN connection I lose the internet connection over the WiFi (client Raspberry Pi). Yesterday, I got the USB-RJ45 Ethernet adaptor but over this, I get the same problem.

I think I need to change routing and forwarding in the configuration.
Can anyone help me with it, please?

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sudo iptables -F
sudo iptables -t nat -F
sudo iptables -X
sudo iptables -t nat -A POSTROUTING -o tun0 -j MASQUERADE
sudo sh -c "iptables-save > /etc/iptables.ipv4.nat"

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