[OpenIndiana-discuss] Why networking not work?

[Nelson H. F. Beebe]

"L. F. Elia" <lfelia at yahoo.com> asks about networking on VirtualBox.

We too found its behavior different from other virtualization systems, 
and I tend to write copious notes about machine issues.  Here is a
fragment of those notes, with generalized hostnames:

The network setup on VirtualBox on vboxhost.example.com is unusual: its
initial network is not bidirectional!  It only connects outbound.

In order to get inbound connections for ssh, it is necessary to add a
second network adapter, which can only be down in powered-off state:

	VirtualBox control panel ->
		Settings -> Network -> Adapter2 -> Attached-to -> Host-only adapter
		Name: vboxnet0

plus
	Advanced ->
		Adapter Type -> Intel PRO/1000 MT +
		Promiscuous Mode: Deny +
		Cable Connected

For the original Adapter1, we have

	VirtualBox control panel ->
		Settings -> Network -> Adapter1 -> Attached-to -> NAT
plus
	Advanced ->
		Adapter Type -> Intel PRO/1000 MT +
		Promiscuous Mode: Deny +
		Cable Connected +
		Port Forwarding

On a reboot, the VM will have two networks, like this example for
guest.example.com:

	% ifconfig -a
	em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
		options=85059b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,LRO,VLAN_HWFILTER,VLAN_HWTSO>
		ether 08:00:27:f2:0b:cc
		inet 10.0.2.15 netmask 0xffffff00 broadcast 10.0.2.255
		nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
		media: Ethernet autoselect (1000baseT <full-duplex>)
		status: active
	em1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
		options=85059b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,LRO,VLAN_HWFILTER,VLAN_HWTSO>
		ether 08:00:27:36:0b:70
		inet 192.168.56.101 netmask 0xffffff00 broadcast 192.168.56.255
		nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
		media: Ethernet autoselect (1000baseT <full-duplex>)
		status: active
	...

sshd normally listens on all network interfaces, so from the
VirtualBox host, vboxhost.example.com, I can now do

	ssh USER at 192.168.56.101

and with suitable $HOME/.ssh/config settings, such as this on
anotherhost.example.com,

	Host = guest.example.com guest
		User = jones
		HostName = 192.168.56.101
		ProxyJump vboxhost.example.com

I can now ssh from anotherhost to the VM on VirtualBox on vboxhost.

-------------------------------------------------------------------------------
- Nelson H. F. Beebe                    Tel: +1 801 581 5254                  -
- University of Utah                    FAX: +1 801 581 4148                  -
- Department of Mathematics, 110 LCB    Internet e-mail: beebe at math.utah.edu  -
- 155 S 1400 E RM 233                       beebe at acm.org  beebe at computer.org -
- Salt Lake City, UT 84112-0090, USA    URL: http://www.math.utah.edu/~beebe/ -
-------------------------------------------------------------------------------