No DNS from DHCP on NAT connection

[Han Fastolfe]

On VirtualBox 6.0.12, with plain NAT configuration, the domain name resolution does not work anymore on Windows/Linux guests on Windows host.

I've checked quite everything on host and guests configuration and come up to the hypothesis that VirtualBox dhcp "server" does not send the DNS address, but it used to do on previous versions.

This is confirmed by DHCP not containing the DNS entry as shown by the following DHCP response:

$ sudo nmap --script broadcast-dhcp-discover

Starting Nmap 7.60 at 2019-09-12 08:08 CEST
Pre-scan script results:
| broadcast-dhcp-discover:
|   Response 1 of 1:
|     IP Offered: 10.0.2.16
|     DHCP Message Type: DHCPOFFER
|     Subnet Mask: 255.255.255.0
|     Router: 10.0.2.2
|     IP Address Lease Time: 1d00h00m00s
|_    Server Identifier: 10.0.2.2
WARNING: No targets were specified, so 0 hosts scanned.
Nmap done: 0 IP addresses (0 hosts up) scanned in 0.51 seconds

[Han Fastolfe]

As a workaround the DNS must be set manually in IPV4 configuration on each VM.

[Valery Ushakov]

Please, provide the log from the VM (as we ask to in the bug submission guidelines).

Also, please, provide the contents of the host's /etc/resolv.conf.