有什么软件可以监视LAN？有什么软件可以监控LAN内各台电脑网络带宽使用情况？ 现有几台电脑通过router上网，需要监控各台电脑使用总带宽的情况。 如：总带宽150K，可以看到电脑甲用了15K，电脑乙用了13K...... 请说明软件的名称，哪里可以下载。 （最好是免费的，或者可以找到注册码的） 谢谢

No such thing if you access from your hostand the network is well-designed network with security consideration, where if you are not priviledged, you are not able to see any other's traffic. If you have the access to the distribution/core switch/router, you can use port mirror to "copy" the data to another port where you can have software/hardware network analyzer to calculate the thing. If you have access, you also can use IP accounting to calculate the average bandwidth utilization in a certain period of time.