IrrelevantSpy wrote:IIRC dm_71 is for preventing UDP-spofing on LANs, not DDoS
That might be what was happening.
It was taking huge amounts of bandwidth (all of my ISP's upstream), and affected other servers on the same rack.
This attack was not just LAN based. and seemed to act like a Botnet where innocent users became the attacker.
Using alternative game ports (ie, 30320) would not work,they'd still attack on that.
Then IOQ3 introduced an improved network protocol (in their test builds) but I haven't found if this actually helps deters the attacks. I wouldn't want to put a server box at risk under a false sense or security.