gentoo-overlay/net-misc/vde/files/vde.conf

# load the tun module
VDE_MODPROBE_TUN="yes"
# virtual tap networking device to be used for vde
VDE_TAP="tap0"
# mode and group for the socket
VDE_SOCK_CHMOD="770"
VDE_SOCK_CHOWN=":qemu"

# This is the actual options string passed to VDE.  Change this at your own risk.
VDE_OPTS="-tap ${VDE_TAP} -daemon"