Is there any program i can limite internet bandwidth over Wi-Fi?

Well i have 4mbps connection and i use 4 iphone 3 laptop.
But suddenly a kid near my home ask for Wi-Fi password for his ipad and i can't reject so i typed Wi-Fi pass on his ipad.
The problem is now that me and my family never download huge file we used for email, entertainment and sometime youtube. But now our internet suddenly slow i guess he might be downloading or steaming HD video i want to limite his bandwidth speed so that me and my family can use internet without falter.

Your router would have to have this capability. It's called "Quality of Service" (QoS). Look for it on your router's administrative page.

Few consumer-grade routers will be able to do QoS control to that level of fineness. I'll suggest that you either change your Wi-Fi password, or use the MAC addressing filtering feature to block your neighbor.

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