As I stated in my earlier post, I have two WAN connections and of course, there’s a need to monitor them. The monitoring logic is pretty simple, it will send me a message on Telegram every time there’s a state change – UP or DOWN.
Initially this monitoring logic was built as OpenWrt hotplug script which used to trigger on interface UP / DOWN events as described in this article. But then I got a mini PC box and it runs Ubuntu and a pfsense virtual machine. While I could build the same logic by discovering hooks in the pfsense code, but it’s too complex and moreover it doesn’t really make sense to monitor the connection of a device using the same connections!