Nothing is more aggravating than a system that doesn't come back properly after a reboot for completely inexplicable reasons right at the point when you were ready to go home.
So this was a network issue. After that reboot I was only able to connect to some IPs but not others within the same vlan, and I could not find anything wrong with the network config. When I discovered I could only ping to even-numbered IP addresses I started to suspect LACP and then I discovered, by accident, that everything worked fine if I put one of the physical network interfaces in promiscuous mode. What the hell.
Just a normal day as a #sysadmin, I suppose... 🙄
@ayo My OpenWRT router drops 1/3 of pings. I have no idea why. So I relate and wish you good luck with solving those issues.
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