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Old 05-10-2011, 02:48 AM   #1
Registered: Oct 2006
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How can I do NAT in VirtualBox


I'm using VirtualBox 4 on OpenSuse 11.3.

I've 6 vm with different OS.

My company uses a net in 10.x.x.x. But I can't use IP of that range (only one for the host). I use IP for my vm in the range 192.168.x.x.

I need my vm to communicate each other, to the host and outside. From outside (10.x.x.x), don't need to access 192.x.x.x.

How do I have to configure Virtualbox?

- Tried with host-only. VM can see each other, but not the outside.
- Tried with NAT. Then VM can't see each other.
- Tried with bridge. Then can't see outside.

An suggestion?

Old 05-10-2011, 03:40 AM   #2
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Set your VMs to NAT, so that they can see the outside. Then add a second network card to the VMs and set them up to be on their own virtual net. This way the VMs can communicate.
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Old 05-11-2011, 08:13 PM   #3
Registered: May 2011
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I suggest using a host-only interface, and then giving access to the outside network the usual way (forwarding and NAT with iptables). When you make a host-only interface, it does in fact show up in your host (vboxnet0 probably).

Assuming there is no firewall, this should work:
- assign IP to vboxnet0 - this is usually done by VirtualBox
- echo 1 > /proc/sys/net/ipv4/ip_forward
- iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
(where eth0 is the interface with the default gateway)
- in guests, set default gateway to assigned IP of vboxnet0
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Old 05-12-2011, 08:50 AM   #4
Registered: Oct 2006
Posts: 294

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Thank your for your reply.

I've decided to change to VMWare (after two year using VirtualBox). With VMWare Player NAT is easy and it allows the creation of VM (not allowed with previous releases).

Probably the routing solution had solved my problem, but I have already migrated my machines.

Thank you


nat, virtual box

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