VirtualBox的NAT，1

VirtualBox (3.2.8)的NAT网络模式在手册里面是这么描述的：

A virtual machine with NAT enabled acts much like a real computer that connects to the Internet through a router. The "router", in this case, is the VirtualBox networking engine, which maps traffic from and to the virtual machine transparently.

这个神秘的NAT engine，是在宿主系统看不到的。而我更希望虚拟机是通过宿主系统的网卡来实现NAT的，这样可以用来模拟测试真实的NAT环境。