If you install a surveillance camera on your Raspberry Pi and want to monitor publicly ,r simply use No-IP to overcome the fact that you don’t have a static public IP address. When dynamic ip changes, noip hostname disconnected.

Just a crontab solve your problem.

To run crontab enter :

crontab -e

Then write the following code in it & save it. (Replace your mail id , password & hostname)

0 * * * * curl -u ‘xxx@gmail.com’:xxxxxxxx “http://dynupdate.no-ip.com/nic/update?hostname=xxxxxxxx.ddns.net”

Enjoy the surveillance publicly.