In the light of the recent and very large scale DDOS attacks that leveraged IoT devices (network cameras and NVRs) I've been pondering how I might get alerted from smallwall when certain things happen. For example, it would be great to be able to get an alert when outbound bandwidth surpasses a predefined level for a predefined amount of time. That would let me know when something was amiss.
In the past I used a small snmp app that ran on Windows and put a tiny traffic graph on my desktop. Something like that but with some triggering of alerts would be useful.
SmallWall supports snmp and something like that, or Icinga can work for alerting. So could Cacti with some plugins. And if you put it on a droplet with digital ocean (and open up snmp to that IP address) you can get e-mail alerts when you Internet is down too.