IPv4 addess same for multiple guest OS in NAT network environment

[pandarus]

When there are multiple Microsoft OS guests running under the NAT network setup, they all receive the same IPv4 address (10.0.2.15). The IPv6 address is notably different. Though routing of packets appears to work from the guest OS environments through the NAT to the Host or Internet, the problem occurs when developing a NAT based network of multiple guest OS where there is an IPv4 interdependency. Basically, they can't see each other because their IP addresses are the same.

[vasily Levchenko]

This is actually how NAT supposed to work. NAT hides the guest from world.