This morning I got a warning about CPU usage on our server... log in to find over 3500 "guests" browsing our forum!
It's not just here either - the other forum hosted on this server was also being battered.
No harm done, it seems; but the sheer number of IP addresses involved is unreal. Mostly from Vietnam, Malaysia, Brazil and a few from China possibly.
I've been adding rules to the firewall to drop the traffic from the busiest suspect IP ranges, but there are so many of them, that I might be catching real users in the fallout. If I do (and you won't see this message unfortunately!) then I apologise. I've got my thinking hat on as to how I can do something a bit more targeted & temporary - a bit like fail2ban but specific to our forum.