These are scripts to check if the IP addresses of a given machine in a dynamic IPs network have changed. It sends e-mails if a change is detected.

In a linux terminal, execute the following commands:

cd ~
git clone https://github.com/HaraldoFilho/check_ip_changes.git
cd check_ip_changes
mv _config.sh config.sh

Open the file config.sh for edit and include the from and to e-mail addresses in its respective variables.

There are three scripts to run:

• check_private_ip_change.sh: Used to check, in a private dynamic IPs network, if the IP address assigned to the machine by the router has changed.
• check-public-ip-change.sh: Used to check if the IP address assigned to the machine or router by the ISP has changed.
• check-ip-changes.sh: Run the two scripts when both internal and external networks have dynamic IPs.

The scripts don't provide any output in the terminal, if a change has been detected an e-mail will be sent with the new IP.

TIP: To periodically check for changes, include one of the scripts in the user's crontab. Do not include in the root crontab, because the script will not run.