This is a simple guide of how to connect USB150 to other mini routers physically. e.g. AR150
ssh to AR150 and install drivers for USB150’s USB ethernet.
opkg update
opkg install kmod-usb-net-rtl8152
Now plug USB150 to AR150’s USB port. It will work as eth2
Now you have two routers connected to each other, just as using a cable. Be sure to change LAN IP in one of them so that they don’t conflict in subnet.
Next step is to find out what you want to implement. e.g. to use AR150 as Tor and USB150 as vpn