三条ISP，20台电脑，三台电脑单独各联一条ISP，另外的电脑通过路由共享三条ISP的带宽。该如何设置。
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一般的企业路由即使有多WAN口，效果也是很差的。如果用这种方案的话就尽量用好点的路由，冗余和分流要能稳定承载的。
另外可以选用软路由的方式，就是用一个台式机加装多网卡做软路由服务器（按你的情况至少要4网卡，三外一内）。台式机即使几年前的性能上也要优于大多硬件路由，搭载软路由系统可以实现外网叠加、分流、带宽限制等等功能。只是初次配置起来比较麻烦。
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