By default VirtualBox provides you with one host-only network interface. Adding more host-only network interfaces on Solaris hosts requires manual configuration. Here's how to add another host-only network interface.
Begin by stopping all running VMs. Then, unplumb the existing "vboxnet0" interface by execute the following command as root:
ifconfig vboxnet0 unplumb
If you have several vboxnet interfaces, you will need to unplumb all of them. Once all vboxnet interfaces are unplumbed, remove the driver by executing the following command as root:
rem_drv vboxnet
Edit the file /platform/i86pc/kernel/drv/vboxnet.conf
and add a line for the new interface we want to add as shown below:
name="vboxnet" parent="pseudo" instance=1; name="vboxnet" parent="pseudo" instance=2;
Add as many of these lines as required with each line having a unique instance number.
Next, reload the vboxnet driver by executing the following command as root:
add_drv vboxnet
On Solaris 11.1 and newer hosts you may want to rename the default vanity interface name. To check what name has been assigned, execute:
dladm show-phys LINK MEDIA STATE SPEED DUPLEX DEVICE net0 Ethernet up 100 full e1000g0 net2 Ethernet up 1000 full vboxnet1 net1 Ethernet up 1000 full vboxnet0
In the above example, we can rename "net2" to "vboxnet1" before proceeding to plumb the interface. This can be done by executing as root:
dladm rename-link net2 vboxnet1
Now plumb all the interfaces using
ifconfig vboxnetX plumb (where 'X' would
be 1 in this case). Once the interface is plumbed, it may be configured
like any other network interface. Refer to the
ifconfig documentation for further details.
To make the newly added interfaces' settings persistent across
reboots, you will need to edit the files
/etc/inet/netmasks, and if you are using NWAM
/etc/nwam/llp and add the appropriate
entries to set the netmask and static IP for each of those interfaces. The
VirtualBox installer only updates these configuration files for the one
"vboxnet0" interface it creates by default.