I would like my raspberry to work as a gateway for LAN devices and connect to Internet. Now the default gateway is my router connected to ISP provider. Basically I would therefore like to share the connection via eth0 to other lan devices and go for the vpn, because an openvpn client is running on RPI.
This is my situation:
So I want that Raspberry, connected in eth0 to router via switch, became the default gateway (192.168.0.100 instead of 192.168.0.1)for client 1-3 to connect to Internet, and be passed under the vpn that runs on the RPI. I have a RPI3 B, wit debian 9 (stretch). Router will be not removed, trafficking is all through wired.