VirtualBox: Find Host IP Address from the Guest Machine (Linux) in NAT Connection

I wrote the way to check host machine IP address from VirtualBox guest machine connected as NAT. Substantially speaking, it is the gateway address of the guest machine.

History

When I launched Kotlin API server in Host, Windows, and Launched Rails Web application in Guest Linux, I needed to know the host machine IP address for accessing to the API.

Environment

Host: Windows 10
Guest: Ubuntu 17.10
VirtualBox version 5.1.30

Method

Use command, netstat -rn, in the guest.

% netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         10.0.2.2        0.0.0.0         UG        0 0          0 enp0s3
10.0.2.0        0.0.0.0         255.255.255.0   U         0 0          0 enp0s3

% netstat -rn

Kernel IP routing table

Destination Gateway Genmask Flags MSS Window irtt Iface

0.0.0.0 10.0.2.2 0.0.0.0 UG 0 0 0 enp0s3

10.0.2.0 0.0.0.0 255.255.255.0 U 0 0 0 enp0s3

The IP address appears in gateway section is the host OS IP address. In above case, 10.0.2.2.

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