Custom Scripts
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VT AIR calls custom scripts on events happening on the system to execute custom actions.

System Notification
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System notifications are new or deleted routes, ipaddresses or link up an down events.
All scripts in the folder */etc/scripts/syschange* are called and the event data are passed along as environment variables.

Gateway Change Notification
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The Gateway Change Notification calls all scripts in the folder */etc/scripts/gatewaychange* and the event data are passed along as environment variables.