I have configured everything perfectly (maybe):
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[root@centos3 ~]# ifconfig
enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.30.103 netmask 255.255.255.0 broadcast 192.168.30.255
inet6 fe80::a00:27ff:fea8:1e6 prefixlen 64 scopeid 0x20<link>
ether 08:00:27:a8:01:e6 txqueuelen 1000 (Ethernet)
RX packets 61 bytes 6491 (6.3 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 55 bytes 7145 (6.9 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp0s8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.30.130 netmask 255.255.255.0 broadcast 192.168.30.255
inet6 fe80::a00:27ff:fed3:2382 prefixlen 64 scopeid 0x20<link>
ether 08:00:27:d3:23:82 txqueuelen 1000 (Ethernet)
RX packets 9 bytes 906 (906.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 19 bytes 1364 (1.3 KiB)
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 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
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[root@centos3 ~]# cat /etc/resolv.conf
# Generated by NetworkManager
search localdomain
nameserver 8.8.8.8
nameserver 8.8.4.4
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[root@centos3 ~]# ping www.google.it
ping: www.google.it: Nome o servizio sconosciuto