To make the modprobe permanent on the HOST "server" side
run the following command in a ssh (or locally)
echo "usbip-host" | sudo tee -a /etc/modules
To make the modprobe permanent on the Client side
run the following command in a ssh (or locally)
echo "vhci-hcd" | sudo tee -a /etc/modules
This will make the needed modules be loaded upon reboot