Gentoo KVM virtual machine support plus networking

The Gentoo Wiki article about KVM uses the less flexible networking setup with dedicated TAP devices like ‘tap0’. While this setup works fine, other distributions use the bridge device in a different way. By creating a virtual bridge and forcing the host system to connect through this bridge, virtual machines can simply connect to the bridge device and ‘plug in’. No need to manually create TAP devices. In this guide we will set up host and guest networking using the virtual bridge device and DHCP for wired ethernet.