pfSense is a free and open-source firewall software that can be configured to send email notifications when the fallback WAN connection goes down. Here are the steps to set it up:
- Log in to the pfSense web interface and navigate to “Services” > “SMTP”.
- Enter the SMTP server details, such as the server address, port, and login credentials.
- Navigate to “System” > “Advanced” > “Notifications”.
- Under the “Actions” tab, select “Add” to create a new action.
- Give the action a name, such as “Fallback WAN Down”.
- Under the “Type” section, select “Email”.
- Under the “To” section, enter the email address that should receive the notification.
- Under the “Subject” and “Body” sections, enter the subject and body of the email.
- Select “Save”
- Go to “System” > “Gateways” and set the fallback gateway.
- Now go to “System” > “Advanced” > “Gateway Monitoring” and set the fallback gateway to be monitored.
- Under the “Actions” section, select the action you created earlier “Fallback WAN Down”
- Click on save
Now, if the fallback WAN connection goes down, pfSense will send an email notification to the specified email address.
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