How to fix/set up routing from host to guest on VirtualBox?

Jonathan

I am using Debian Stretch to run a Debian jessie guest. I have a guest setup using NAT and a host-only adapter. When I try to ping my guests from the host, my pings are routed to my wireless internet adapter instead of the virtual network.

From ifconfig -a, virtual host network only:

vboxnet1: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        inet 172.16.57.1  netmask 255.255.0.0  broadcast 172.16.255.255
        ether 0a:00:27:00:00:01  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

and my wireless adapter:

wlp4s1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.103  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::218:39ff:fe19:2edd  prefixlen 64  scopeid 0x20<link>
        ether 00:18:39:19:2e:dd  txqueuelen 1000  (Ethernet)
        RX packets 473074  bytes 138461228 (132.0 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 438482  bytes 389764274 (371.7 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

My routing table:

$ netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG        0 0          0 wlp4s1
192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0 wlp4s1

I'm hoping there will be some routing netstat -rnin the next job of directing the relevant traffic to only virtual hosts , but I can't see that.

When I try to ping my guest (puffin) from the host:

$ ping puffin
PING puffin (172.16.57.101) 56(84) bytes of data.
From 1-128-201-31.ftth.glasoperator.nl (31.201.128.1) icmp_seq=1 Packet filtered

I statically set the guest's IP address (on the eth1/host-only adapter) to 172.16.57.1​​01 (and it's up), and disabled dhcp on vboxnet1 (the host-only network).

edit:

I found the following problems:

ip link
...
5: vboxnet1: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000
    link/ether 0a:00:27:00:00:01 brd ff:ff:ff:ff:ff:ff
Jonathan

Apparently VirtualBox can't start vboxnet0/vboxnet1, I noticed this when I did:

$ ping -I vboxnet1 puffin
connect: Network is unreachable

can find the problem

$ip link
(...)
5: vboxnet1: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000
    link/ether 0a:00:27:00:00:01 brd ff:ff:ff:ff:ff:ff

The following resolved the issue:

sudo ip link up vboxnet1

Now I get:

$ip link
(...)
5: vboxnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
    link/ether 0a:00:27:00:00:01 brd ff:ff:ff:ff:ff:ff

More details can be found:

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