how to disable internet connection of another computer in same network remotely?

[razifp]

The another computer is mainly used by kids, so I need to restrict it!.
OS: Windows XP
Wired connection

 

[jjs0891]

Go into your router settings from your web browser and there should be some sort of network filter that you can turn on and block certain MAC addresses (internet devices).

 

[das_stig]

Most good routers have whitelist feature where you can specify what sites are accessible from a IP/MAC address and blacklist to stop connections to sites.