So I got
Host: Hyper-v enabled machine with four NICs, only one enabled. Network type: External
IP configuration are correct for both host and guest (getting it from the DHCP of the company network)
The same configuration works on a machine with single NIC
But With this other machine, with 4 NICs, there is no Internet in the guest, actually it can't ping any IP expect the host (pings host IP only, not the name)
I searched the Internet and did every solution, more than once, with no success.