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you can make a linux machine route, just easier to use a pre-rolled image
# Enable IP Forwarding echo -e '\n#Enable IP Routing\nnet.ipv4.ip_forward = 1' | sudo tee -a /etc/sysctl.conf sudo sysctl -p # NET for VPN Tunnel sudo iptables -t nat -A POSTROUTING -o tun0 -j MASQUERADE sudo iptables -A FORWARD -i tun0 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT sudo iptables -A FORWARD -i eth0 -o tun0 -j ACCEPT systemctl enable netfilter-persistentis what I used in my ubuntu os above.
note: there's probably a billion times better way to do this, I was just fucking around when I made htis thing.
Kirth
If you want to route through the pi, you'd have to set it up as a router, I'd have thought. Openwrt or similar.
Or you could set up your clients to tunnel to the Pi acting as a NPN server, and the Pi forwards the traffic as a VPN client. Ick.
Currently, your clients are sending port 53 traffic to the Pi, (or your router is redirecting all requests. Or it should be.), and probably little else.
A router that could forward all traffic would be probably be the best setup.
Obvs I'm waybout of my depth here.