VirtualBox NAT Network

natnetwork

C:\Program Files\Oracle\VirtualBox> .\VBoxManage list natnets
NetworkName:    incubator
IP:             192.168.99.1
Network:        192.168.99.0/24
IPv6 Enabled:   No
IPv6 Prefix:    fd17:625c:f037:2::/64
DHCP Enabled:   No
Enabled:        Yes
loopback mappings (ipv4)
        127.0.0.1=2

C:\Program Files\Oracle\VirtualBox> .\VBoxManage list dhcpservers
NetworkName:    HostInterfaceNetworking-VirtualBox Host-Only Ethernet Adapter
IP:             192.168.56.100
NetworkMask:    255.255.255.0
lowerIPAddress: 192.168.56.101
upperIPAddress: 192.168.56.254
Enabled:        Yes

VirtualBox(has 192.168.99.1) does NOT serve DHCP.
DHCP server (and DNS relay) is 192.168.99.2 in my sandbox environment.

and 192.168.99.2's configs are
https://gist.github.com/hytdsh/81c410924009d7e3af979bdfc1b274dd
https://gist.github.com/hytdsh/636fa25c344e5446f4dbbfae06392a8a

CAUTION:
"DHCP Enabled:" status does NOT appeare in "VBoxManage list dhcpservers".
and
"VBoxManage natnetwork list" does NOT include "DHCP Enabled:" status.