Hi,

Results of route-n and ifconfig:

# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.0.2.1 0.0.0.0 UG 100 0 0 eth0
10.0.2.0 0.0.0.0 255.255.255.0 U 100 0 0 eth0
root@kali:~#
root@kali:~#
root@kali:~# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.2.15 netmask 255.255.255.0 broadcast 10.0.2.255
inet6 fe80::a00:27ff:fea1:50cb prefixlen 64 scopeid 0x20<link>
ether 08:00:27:a1:50:cb txqueuelen 1000 (Ethernet)
RX packets 201913 bytes 296808930 (283.0 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 30926 bytes 2493249 (2.3 MiB)
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 30 bytes 1696 (1.6 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 30 bytes 1696 (1.6 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

root@kali:~#

Ipconfig windows:

Ipv4 address 10.0.2.4
Subnet mask 255.255.255.0
Default Gateway 10.0.21

Windows VM is up and running.

Using Nat Network for both VM machines.