http://stackoverflow.com/questions/1261975/addressing-localhost-from-a-virtualbox-virtual-machine

10.0.2.2
    ?? host

10.0.2.3
http://serverfault.com/questions/453185/vagrant-virtualbox-dns-10-0-2-3-not-working

DNS
    natdnshostresolver1

Host-Only

IpV6 Address:
fe80:0000:0000:0000:0800:27ff:fe00:0000

IpV6 Network Mask Length
64


systemctl restart networkmanager
systemctl restart network
ifdown <devicename, e.g. enp0s8>
ifup <devicename, e.g. enp0s8>