How to access guest VMs from outside network?

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http://askubuntu.com – My problem is how to access guest VM from outside network. I am going to describe my problem in details. I have single machine with Ubuntu Server 12.04 LTS contains two NICs. One NIC is connected to my gateway(i.e. and is IP address of this interface. Another NIC has IP but this is a part of Bridge(i.e. br0). I created two guest Ubuntu 12.04 LTS Desktop VMs with IP address and My /etc/network/interfaces file is as following: The loopback network interface auto lo iface lo inet loopback The primary network interface auto eth2 (HowTos)