I usually do not have physical interfaces on my hosts, which are free to share with Virtualbox - they are usually in use with virtual network infrastructure from VDE and/or OpenVswitch. I recently detected, that Virtualbox will crash down the complete host, if used with OpenVswitch ports ( see: viewtopic.php?f=7&t=79446 ).
Linux offers a lot of different interface types, if one issues:
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ip link help
.....
TYPE := { vlan | veth | vcan | dummy | ifb | macvlan | macvtap |
bridge | bond | ipoib | ip6tnl | ipip | sit | vxlan |
gre | gretap | ip6gre | ip6gretap | vti | nlmon }
Thanks anyway,
Manfred