virtualbox.org

Hello all,
I have a windows 7 host machine with 3 virtual machines:
Client: XP
Router: Centos 6
Server: 2008 R2

Network info:
interface0 between client and router
interface1 between router and server
I have NAT on all the machines

Problem/Question: I can access all the services which I serve on my server 2008r2 (i.e. DNS), but when I am trying to reach these service from another computer on the same subnet/network to my windows 7 host machine, cannot reach them in any form! I can ping my router with NAT and HOST ip address from other machine but can't reach the port. I turned off the router and added some rule to forward the port, but again it doesn't work.
can anyone help me with this?

Don't use NAT but use Bridged if you want machine from your lan to be able to connect to your VMs.
If you only want VMs to talk to each other and nothing else, recommended is to use Internal mode.
Refer to User Manual for more information.