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</o:shapelayout></xml><![endif]--></head><body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'><div class=WordSection1><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:宋体'>工作中遇到一个问题，找了一些熟人都没有得到一个确切的答案，所以到这里来求助，希望有经验的大虾给点意见。</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:宋体'>项目遇到一个网络穿透的问题，需要两个客户端之间</span><span lang=EN-US>UDP</span><span style='font-family:宋体'>通信，但是客户端可能处于内网，要经过路由器或者防火墙。</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:宋体'>在网上查了下关于</span><span lang=EN-US>NAT</span><span style='font-family:宋体'>的资料，都说</span><span lang=EN-US>NAT</span><span style='font-family:宋体'>的类型有四种，两个客户端之间的话有</span><span lang=EN-US>4*4</span><span style='font-family:宋体'>种组合。但是我问做网络的熟人，都说没有听说过这四种类型。</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:宋体'>公司的路由器和防火墙也没有看到相关的设置。</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:宋体'>我想问下，这四个类型到底是在什么时候确定的，路由器出厂是确定？路由器安全级别决定？</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:宋体'>或者普遍是某种类型。</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:宋体'>希望得到各位的帮助，这里是</span><span lang=EN-US>ubuntu</span><span style='font-family:宋体'>的邮件列表，这个问题和</span><span lang=EN-US>ubuntu</span><span style='font-family:宋体'>也没有什么关系，但实在是没找到其他的可求助的地方，希望管理员体谅，谢谢。</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:宋体'>参考资料：</span><span lang=EN-US><a href="http://blog.chinaunix.net/uid-11572501-id-2868691.html">http://blog.chinaunix.net/uid-11572501-id-2868691.html</a><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>