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I have some interested in monitoring home network because the speed of internet access is very slowly around one month ago. And it's still same at this time. I called my ISP to ask and try to deal with this problem. They said internet traffic from my network is too high, up to maximum upload speed.
If they said the truth, my guess is some machine in my network do something strange or event infected by some kind of malware and they don't know that. Of course the problem is not from my computer, I already checked. I'm not have permission to access all computers in network. So I think, the solution to find out problem is monitoring network.
In a company, they can do that easily, because they have enough money and resource. But this situation is my home network (using tp-link W8910-G) and I just a programmer. I can buy new network device to support monitoring if it not to expensive. Please help me with some guide. Thanks.