I'm trying to run an Ubuntu Server 16.04 guest in an Ubuntu 15.10 host in a host-only network in VirtualBox. I know very few questions like this, their configs are not exactly the same as mine, and I'm still confused after reading them.

Guests can ping and get data from the host and external websites.

The host cannot ping the guest or connect to any web services running on the guest.

I'm following these instructions but with some details changed.

in VirtualBox

A host-only network is created, vboxnet0with an address 192.168.100.0and netmask 255.255.255.0.

The guest has NAT for adapter 1 (default) and vboxnet0as adapter 2 .

on the host

#> ifconfig vboxnet0
vboxnet0  Link encap:Ethernet  HWaddr 0a:00:27:00:00:00
      inet addr:192.168.100.0  Bcast:192.168.100.255  Mask:255.255.255.0

on the guest

This is/etc/network/interfaces

# The loopback network interface
auto lo
iface lo inet loopback

# Host-only interface
# vboxnet0 Host Only Adapter has address 191.168.100.0
# guest has address 192.168.100.1
auto enp0s8
iface enp0s8 inet static
        address         192.168.100.1
        netmask         255.255.255.0
        network         192.168.100.0
        broadcast       192.168.56.255

# NAT interface
auto enp0s3
iface enp0s3 inet dhcp

The interface name is not eth0etc, apparently this is due to kernel evolution, it should be fine.

After rebooting, this isifconfig

This seems to show the correct inet address enp0s8(it's a "host-only" adapter), and enp0s3is NAT, which seems to work fine.

if i runroute

I don't know how to interpret this exactly, but for some reason it lists 192.168.100.0it instead 192.168.100.1, which is ifconfigand /etc/network/interfacesthere is.

Edited in an earlier version of this question , the guest's static IP is not in the netmask range of the "host-only" adapter. Then, pingit seems to hang, now ping 192.168.100.1spawn from the moderator

PING 192.168.100.1 (192.168.100.1) 56(84) bytes of data.
From 192.168.100.0 icmp_seq=1 Destination Host Unreachable

What's wrong? thanks.