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[问与答] WAN 和 LAN 的区别是什么

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我能理解 WAN 口是外网，LAN 口是内网，几个 LAN 口之前是交换机模式

我好奇的是 LAN 的数据是怎么转发到 WAN 口的，比如 LAN 的 IP 都是 192.168.88.0/24 网段，外网 ip 地址是 10.0.0.1/24. 那 WAN 口是有两个网卡吗，一个是 192.168.88.1 一个是 10.0.0.1 ？

如下图 https://help.mikrotik.com/docs/download/attachments/220233819/UPnP.png?version=1&modificationDate=1698231810297&api=v2

我的问题可能是路由器内部是怎么工作的，现在只有模糊的概念，或者需要看什么书，有什么帖子能讲清楚这个

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