You can probably do this for VirtualBox (and any Linux program) by using tun2socks to create a network interface that routes through a proxy (SOCKS5 if you want

You can probably do this for VirtualBox (and any Linux program) by using tun2socks to create a network interface that routes through a proxy (SOCKS5 if you want UDP support), and then moving that network interface to a new namespace. You can run VirtualBox or any other programs in that new namespace, they don't have to be aware of the proxy at all (since they just see a regular gateway). https://github.com/xjasonlyu/tun2socks https://github.com/xjasonlyu/tun2socks