[SGVLUG] VirtualBox networking question

[Claude Felizardo]

Hey guys, sorry it took a while to get back to this.  I had to move back to
my cubicle office after temporarily moving to another office with a real
window while they did some minor construction then I had a couple of other
things that took priority for a while...

Anyway, I finally got a chance to look at this and got it working.  They
key as Matthew pointed out was to set the adapter type to "Bridged" instead
of the default "NAT".  I'm doing this at work so I can't just assign
"random" IPs nor can I muck with the firewall or routers.

So I've got two virtual machines, both are configured for DHCP and use the
live ethernet device as my desktop.   The difference is the VM with NAT,
even though it has a 10.0.x.x address, it looks like it's coming from my
desktop so it can access machines on the local subnet as my desktop.  The
other VM with the bridged adapter has an IP from a DHCP server from outside
the subnet so it can NOT access things that are restricted to project
internal machines only which is exactly what I wanted.

I did not have to make any funny cables, use any proxy servers or external
machines nor did I have to create a VM to act as some kind of server.

  Not sure if changing the MAC address made a difference.

Actually, strike that.  I'm having a problem trying to reproduce this.
 Looks like it really depends on which DHCP server responds determine if I
can see the restricted servers or not.  Could be that the DHCP servers are
getting tired of my asking for a new IP over and over?  Or perhaps its the
winxp and win7 machines that are getting tired of being yanked around.  I'm
currently installing ubuntu, we'll see how that goes...

Nope, I installed the latest ubuntu and it looks like the local DHCP server
gave me an IP on the same subnet.  Rats.

Claude



On Fri, May 25, 2012 at 9:04 AM, Matthew Campbell <dvdmatt at gmail.com> wrote:

> Yes, it's fairly easy to set this up in VB.
>
> You can even set it up through DHCP if you are a masochist ;)
>
> Matt
>
> - Put the VB Vnetwork NIC in bridge mode
> - Assign it a unique MAC address
> - Configure DHCP to assign an outside IP address to that MAC (or hard code
> it, much easier)
> - Configure your router to route that 1 address to the big bad world in
> addition to its current nets.
> -easy peasy
> On May 24, 2012 8:13 PM, "nopbin at gmail.com" <nopbin at gmail.com> wrote:
>
>> With constraints as described, Virtualbox is not going to get you an ip
>> address outside your firewall.  Best bet is to use an aws node or something
>> like that if you don't have wired or wireless access to an external network.
>> On May 24, 2012 7:57 PM, "Claude Felizardo" <cafelizardo at gmail.com>
>> wrote:
>>
>>> I believe there are a couple of people on this mailing list who are
>>> using VirtualBox or equiv...
>>>
>>> Has anyone setup a VirtualBox guest machine so it can access the
>>> internet but can not access the host's local network?  Basically create a
>>> network sandbox.
>>>
>>> For example, let's say I want to verify that an internal web server can
>>> NOT be accessed from the internet yet I want to be able to access it from
>>> my desktop and I don't have access to a machine outside my network to test
>>> from.  So using VirtualBox, I created a virtual machine running Ubuntu.
>>>  When I bring up a browser, I'm able to access a web server as if I was
>>> connecting directly from my desktop.  I want to configure this virtual
>>> machine so it has an IP address outside my local network.
>>>
>>> Any suggestions?  Tried googling but either it can't do it or I'm just
>>> not using the right keywords.
>>>
>>> Claude
>>>
>>>
>>>
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