DHCP server over internal adapter VirtualBox

I am trying to create simple network between two VM in VirtualBox using Internal Adapter and isc-dhcp-server. Both VM's are connected with intnet network adapter, and the main one has installed and configured isc-dhcp-server. The second one has configured to receive network address with dhcp . But in the ping from dhcp client is not received by dhcp server. And I have no idea what caused such an issue. Could you please help me to troubleshoot this. Below is configuration files from server/client sides.

Client /etc/network/interfaces:

auto enp0s3
iface enp0s3 inet dhcp

Server /etc/dhcp/dhcpd.conf

option domain-name "gw-serv.org";
option domain-name-servers 172.16.3.1;
default-lease-time 3600;
max-lease-time 7200;
ddns-update-style none;
authoritative;
log-facility local7;
subnet 172.16.3.0 netmask 255.255.255.0 { option routers 172.16.3.1; option subnet-mask 255.255.255.0; range 172.16.3.2 172.16.3.254;
}

/etc/default/isc-dhcp-server:

INTERFACESv4="enp0s9"

Network interfaces on dhcp server + nmap scan of dhcp IPs

Network interfaces on dhcp client

1 Answer

Ok, there was no problem with isc-dhcp-server configuration files, the problem was in wrong order of Host-only adapter and Internal adapter. After changing enp0s8 to enp0s9 and enp0s9 to enp0s8 everything started to work just fine.

The solution was found due to switching off adapters from VirtualBox GUI, and testing server ifconfig output.