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Malcolm,<br>
<br>
Just to be clear, is this your topology?<br>
<blockquote>
<pre>Public |--------| VBox NAT Network process |---------| Router VM |---------| Hidden network</pre>
</blockquote>
If so, I'm not aware of options to include static routes into the
NAT engine of VirtualBox, but I also don't see why you would need
to.<br>
it's the job of the router VM to also do NAT to hide that final
network, else you need the "public" routers to know about that
hidden network but that defeats the point of using NAT in the first
place.<br>
If this is your topology, I feel you're just using the wrong tool
for the job.<br>
<br>
If your topology is different, let us know and we'll help further!<br>
<br>
<div class="moz-cite-prefix">On 03/10/16 22:34, Malcolm Clarke
wrote:<br>
</div>
<blockquote
cite="mid:FBB6BBACC666694F892E994A40E2714956BA3DFD@v-ex10mb3.academic.windsor"
type="cite">
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charset=windows-1252">
<p>Dear Maxine</p>
<p>The problem is that a packet can eminate from a VM on the
hidden subnet and is correctly routed by the internal router to
the NAT router (the internal server contains the NAT as its
default router), and so the packet is sent to the public
network. The NAT router will correctly create an entry in the
mapping table with the return IP address. However when a packet
returns from the public network, even though the NAT router can
substitute the correct destination IP address for the hidden
subnet, it does not have the routing information to deliver the
packet to the internal router for it to be returned to the VM on
the hidden network.</p>
<p>It would therefore require some simple mechanism to add static
routes (or private side default gateway) to the NAT router.</p>
<p>Using a bridge will not work as that would require configuring
"public" routers to deliver packets to the internal router. NAT
is the best solution.<br>
</p>
<p>Regards</p>
<p>Malcolm<br>
</p>
<br>
<div class="moz-cite-prefix">On 03/10/2016 13:58, Maxime Dor
wrote:<br>
</div>
<blockquote
cite="mid:5711fe0c-e7f8-ff8b-cf4c-c7fe58b21453@kamax.io"
type="cite">
Hi Malcom,<br>
<br>
That is on purpose - being behind a NAT network means you want
to hide any subnet connect to that network from the outside
world.<br>
Any outgoing connection will look like it came from the NAT
Router "public" IP.<br>
If you want to allow specific connections to be allowed in, you
need to configure port forward - so far, I don't think I tell
you anything new.<br>
<br>
But if you need the "outside" world to know about "inside"
networks, then NAT is not the right choice. You need to switch
to a non-NAT solution like Bridged mode (or Host-Only with
routing enabled on the host) and the "outside" world needs to
know about those "inside" network with two possibilities:<br>
- Static routes on all routers that need to deal with those
subnets<br>
- Internal routing protocol like RIP, EIGRP or OSPF that will
auto-detect routes and populate routing tables of routers.<br>
<br>
<div class="moz-cite-prefix">On 03/10/16 13:30, Malcolm Clarke
wrote:<br>
</div>
<blockquote
cite="mid:FBB6BBACC666694F892E994A40E2714956BA3BD5@v-ex10mb3.academic.windsor"
type="cite">
Dear Development Group<br>
<br>
I am trying to demonstrate routing in a virtualised network
created using VirtualBox with a FreeBSD server acting as
router between 2 virtual networks. One network is set as NAT
Network to allow access to outside world. However, although
packets can be directed from the router to the NAT router for
outward delivery, the NAT router does not know how to deliver
the incoming packets for the "hidden" subnet.<br>
<br>
I wonder if anyone has modified the NAT network to allow
simple static routes or default gateway to support this
cnfiguration.<br>
<br>
I do not know the interest for this functionality and whether
the work is justified for the use that would be made.<br>
<br>
Regards<br>
<br>
Malcolm<br>
<br>
<br>
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<b><span style="color:#C0504D">Malcolm Clarke </span></b><span
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<p class="MsoNormal"
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