I made one years ago that pretended to be an Ethernet adapter as soon as you plugged it into your USB port.
it would boot, connect to WiFi, then connect to VPN, and the laptop it was plugged into would then use that as the primary network source as if it was connected to a lan.
downsides:
WiFi sucks and I only saw ~ 250mb connections
USB is slow capped at 450mb
but it does work in a pinch.
I think RPI A and B were gadget capable but they dropped support after rpi2 was released.
don’t forget you’re going to need to setup the proper routing tables and install a DHCP server(maybe…might be able to do static routing but I found it easier to just install dnsmasq).
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sounds like you want a rpi-zero Ethernet gadget.
I made one years ago that pretended to be an Ethernet adapter as soon as you plugged it into your USB port.
it would boot, connect to WiFi, then connect to VPN, and the laptop it was plugged into would then use that as the primary network source as if it was connected to a lan.
downsides:
but it does work in a pinch.
I think RPI A and B were gadget capable but they dropped support after rpi2 was released.
don’t forget you’re going to need to setup the proper routing tables and install a DHCP server(maybe…might be able to do static routing but I found it easier to just install dnsmasq).