Windows Active Directory access not working with active NAT

[Resu]

When I have two network connections (internal network for active directory access and registered DNS and a NAT card) I'm not able to access the active directory.

The domain controller is running on a separate machine and my windows client machine, that has joined the domain network, can access the domain only when i deactivate the NAT network card.

Running a ping with active NAT it can resolve the domain controller, but pings the internal IP like 127.0.0.X. When a deactivate the NAT network card, the ping returns the correct IP from the internal network like 192.168.0.X.

[Valery Ushakov]

Please, can you provide exact network configuration/topology, exact commands, their output etc. Unfortunately it's not clear from your description what is that you are trying to do.

[Resu]

(not relevant in my eyes)

[Resu]

I've attached some files with my network configuration. The pingComparison file shows the difference when accessing the domain controller from the client. Before release v4.3.20 everything worked fine, but till this release i have the problem (currently installed version: 4.3.26).

[Valery Ushakov]

There's a name collision that is indicated to you by ​127.0.53.53. When client has NAT network up, it probably has access to another resolver or something. Anyway, the problems is with your network configuration, not with VirtualBox.