On Sun, Mar 13, 2011 at 1:34 PM, Christian Alis <[email protected]> wrote:
> Hi!
>
> I would like to set up a web server for our institute. This web server is a
> virtual machine (Centos 5.4) running on our internal server (Centos 5.4). This
> virtual machine is supposed to be placed in the DMZ and so it has a different
> subnet from the internal server. If it were a real machine, enabling proxy-arp
> in our switch would make the virtual machine accessible in the DMZ and outside
> network. However, the VM is inaccessible even in the internal subnet.
>
> I am under the impression that this is possible with virtualbox's bridged
> ethernet interface because virtualbox's "network manager" places the real
> interface into promiscuous mode and packets sent and received by and for the
> guests use the guests' MAC and IP address. Is my impression wrong? If not, 
> what
> I am doing wrong? Is there a better approach to my problem?
>

Bridged mode *is* the solution.

Your guest will be able to connect both-ways (upload+download) to your
real network.
Simply bridge your VM's eth0 to host's "eth0" and you're done.

If you want more security, then bridge VM's eth0 to host's "eth1" NIC,
but remove IP addresses from host's "eth1".

-- 
-Alexey Eromenko "Technologov"

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