Configuring VirtualBox host only networking: OSX host, Ubuntu guest
I reconfigured the vboxnet0
virtual adapter IP on the host to 192.168.21.19
so it differs from the guests configuration of .20
- then they don't clash. See my updates in the post with more details about the solution.
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Greg K
"Simplicity is prerequisite for reliability" - Edsgar Dijkstra
Updated on September 17, 2022Comments
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Greg K over 1 year
SOLVED: I got this working by reconfiguring the vbox network settings to 192.168.21.19 (in VirtualBox -> Preferences -> Network) and commenting the line specifying a gateway as it's not needed (no external access on the host only interface) as per this post.
I can then SSH to
192.168.21.20
from OSX and connect to Ubuntu. I changed my/etc/fstab
mounts to point to//192.168.21.19/
I have a Ubuntu guest configured with two interfaces,
eth0
is using NAT and works fine, I can access the net.The second interface
eth1
is set to host only networking and VirtualBox has created avboxnet0
virtual adapter on the host.I've configured
vboxnet0
in VirtualBox adapter settings with the following:ip 192.168.21.20 subnet 255.255.255.0
Once the VM guest is running,
ifconfig
on OSX hasvboxnet0
setup as:vboxnet0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 0a:00:27:00:00:00 inet 192.168.21.20 netmask 0xffffff00 broadcast 192.168.21.255
In the guest,
eth0
is set to use DHCP, I've statically assignedeth1
to 192.168.21.20 (this was a mistake and the IPs clash between host and guest):auto eth1 iface eth1 inet static address 192.168.21.20 (should be .19) netmask 255.255.255.0 network 192.168.21.0 broadcast 192.168.21.255 gateway 192.168.21.1
There is no device on 192.168.21.1 - what should I set my gateway to? (turns out a gateway is not needed as it's a HOST only interface). Net access is provided by the NAT adapter.
In the guest the routes look like so:
Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.21.0 * 255.255.255.0 U 0 0 0 eth1 10.0.2.0 * 255.255.255.0 U 0 0 0 eth0 default 10.0.2.2 0.0.0.0 UG 100 0 0 eth0 default 192.168.21.1 0.0.0.0 UG 100 0 0 eth1
Route table on OSX:
$ netstat -nr Routing tables Internet: Destination Gateway Flags Refs Use Netif Expire default 10.77.36.1 UGSc 28 0 en1 10.77.36/22 link#5 UCS 5 0 en1 10.77.39.38 127.0.0.1 UHS 1 2236 lo0 10.77.39.255 link#5 UHLWbI 1 66 en1 127 127.0.0.1 UCS 0 0 lo0 127.0.0.1 127.0.0.1 UH 1 8642 lo0 169.254 link#5 UCS 0 0 en1 192.168.21 link#7 UC 2 0 vboxnet 192.168.21.20 a:0:27:0:0:0 UHLWI 0 4 lo0 192.168.21.255 link#7 UHLWbI 2 64 vboxnet
I can't SSH from the host to the guest (I used to be able to when the VM was configured with a bridged connection):
$ ssh 192.168.21.20 ssh: connect to host 192.168.21.20 port 22: Connection refused
What have I done wrong here? TIA