just for the logs, if you are disconnected by your ISP every 24 hours and you like this to happen during the night you will like this re-connect script for pppd based connections.
killall -HUP pppd
if you like you just add it at 04:00 in the morning to your cron 🙂
0 4 * * * /path-to/re-connect.sh
not to forget the
chmod u+x <path-to-script>/re-connect.sh