How to turn on QoS for speed limiting on BSNL Fiber routers?

The other option would be to block the access with firewall for his MAC.;)
 
Well in my Netgear router i can boot out anyone via app from connected devices. So knowing password doesn't help unless he gets new device each time.
 
i guess his issue is that he is not able to refuse connectivity to the guy. so he wants to slow down his internet so that either he gets frustrated and get his own connection or not consume significant amount of data.
 


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