Yes you can.
Today I needed to test an openconnect VPN connection while inside a LAN. At this site my desktop is Windows but I needed to check connectivity from outside for Linux users, using the openconnect and NetworkManager-openconnect packages.
Let's see, I could plug my smartphone into the USB port of the desktop, forward the USB connection to Fedora 16 inside VirtualBox and I should be able to connect to usb0 and I would have a WAN connection from outside. Right?
To cut to the chase, it just works.
In the VirtualBox, make sure USB forwarding is enabled in the VM settings. Plug in the smartphone and turn on USB tethering. Ignore Windows suggestions to install hardware drivers for your smartphone. When the VM is running, there will be a USB icon on the bottom bar. Choose the USB device that is your smartphone. Windows will suggest installing a VirtualBox USB driver. Do that. On Linux a usb0 device should appear in the network manager and after disabling the eth0 device which forwards to Windows, you can connect to it. You should then get a DHCP lease from your smartphone and be connected to the outside world.
It seems you have to install the VirtualBox USB driver every time the VM is started, not sure why.
This should work on other distros. For example I know openconnect works on Debian and Ubuntu. It should also work for other VPN technologies, such as openvpn. The USB network driver is called cdc-ether, by the way.
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