虚拟机NAT上网
1.开启dhcp和nat，开启之后虚拟出vm8
<img src="http://dl.iteye.com/upload/attachment/471539/cd0d8691-d63e-3dd0-857a-3fa90faff4ec.jpg" alt="虚拟机NAT下网">
<img src="http://dl.iteye.com/upload/attachment/471546/59b11104-4124-34c9-b730-a68baf904f64.jpg" alt="虚拟机NAT下网" width="549" height="55">
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2.选择虚拟机上网方式为，自定义，选择vm8
<img src="http://dl.iteye.com/upload/attachment/471570/21de8fc2-3f22-3e47-a946-a7e2377dc2eb.jpg" alt="虚拟机NAT下网" width="604" height="458">
3.虚拟机ip和dns自动获取
