Veja que meu Host reconhece as duas placas de rede do Guest:
galactus@NorrinRadd:/var/www/html$ ifconfig
enp7s0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether a4:1f:72:ff:9f:f0 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 5982 bytes 830433 (830.4 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 5982 bytes 830433 (830.4 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
vboxnet0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.56.50 netmask 255.255.255.0 broadcast 192.168.56.255
inet6 fe80::800:27ff:fe00:0 prefixlen 64 scopeid 0x20<link>
ether 0a:00:27:00:00:00 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1055 bytes 217873 (217.8 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
vboxnet1: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.56.60 netmask 255.255.255.0 broadcast 192.168.56.255
inet6 fe80::800:27ff:fe00:1 prefixlen 64 scopeid 0x20<link>
ether 0a:00:27:00:00:01 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 869 bytes 165061 (165.0 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlp6s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.43.194 netmask 255.255.255.0 broadcast 192.168.43.255
inet6 fe80::5dd4:6783:f7b9:a55c prefixlen 64 scopeid 0x20<link>
ether 54:35:30:fe:d9:01 txqueuelen 1000 (Ethernet)
RX packets 828237 bytes 1089377733 (1.0 GB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 363005 bytes 46042746 (46.0 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
galactus@NorrinRadd:/var/www/html$