I am running VirtualBox on a Windows 8.1 host with ESET firewall and OpenVPN. For security reasons I would like to completely block internet access on the host machine (all traffic except what is used by VirtualBox) and use a guest machine running Linux for all my online activity.
Currently I have a guest with Linux Mint installed but am happy to use debian, fedora, suse etc.
(N.B. The software I use for work is windows-only and very hardware intensive so I would rather not run it in a VM.)