install nxfilter on osmc

sudo apt-get install oracle-java8-jdk

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sudo apt-get install openjdk-8-jre-headless

wget http://pub.nxfilter.org/nxfilter-4.3.8.2.deb

sudo dpkg -i nxfilter-4.3.8.2.deb

sudo systemctl enable nxfilter.service

sudo systemctl start nxfilter.service

Enable IP authentification. The clients will be authenticated by NxFilter using the IP address. For that configure your network to assign a static IP for each client.

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Parental control with DNS filtering on Raspberry Pi

sudo nano /nxfilter/bin/startup.sh