It’s 3am and your ISP has quietly dropped your WAN connection. Not a hard link-down, nothing that dramatic. The cable modem still has sync, the LEDs are green, DHCP is up. But somewhere between your house and the wider internet, a route has gone stale or a BRAS has crashed or someone at the telco has pushed a config change and not tested it properly. Your firewall has a default route pointing into a void, your DNS queries are timing out, and you’re fast asleep with no idea any of this is happening.
[Read More]Building an OpenBSD Home Router, Part 5: Automation and Operations
