Hi.

I want to get this VM configuration: Internet <-- OpenBSD(VM1) <--
Firewall(VM2) <-- AppVM(VM3)

I use OpenBSD as a NetVM. I call it VM1. I assigned the PCI network card
to this VM, and it has an em0 interface to connect to the internet.
I'd like this OpenBSD VM to be the NetVM for other Qubes, so I created a
new debian AppVM (VM2), which has no NetVM of its own, and I made it the
NetVM of Openbsd(VM1):   OpenBSD(VM1) --> VM2

This made it possible to get an xnf0 interface in OpenBSD(VM1).
I have enabled IP forwarding and enabled Nat for xnf0, and I can ping
google from the xnf0 interface, meaning that it has internet access: ping
-I xnf0 8.8.8.8

I made VM2 the NetVM for VM3. VM1 --> VM2 <-- VM3

I enabled IP forwarding in VM2 and I tested some IPtables configurations
for allowing forwarding between the 2 interfaces in VM2. I made it
possible to ping the xnf0 interface in VM1 from VM3. But when I can't ping
an internet address.

Could you please tell me what I need to do in VM2 so that I can make VM2
act like a regular firewall VM, even theough it is a default Qubes NetVM?

Thanks.


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