/Shell/Bash/Disable public internet access linux

Disable public internet access linux

GW="$(sudo /sbin/route -n | awk '$1=="0.0.0.0" {print $2; exit}')"
sudo /sbin/route del default gw "$GW"
echo "$GW" >~/my_tmp_file

The last line saves the value in a file for later use when you want to restart the network:
sudo /sbin/route add default gw "$(cat ~/my_tmp_file)"

Source: superuser.com

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