well. I have been hosting Q3A for many years, and in November 2011, I noticed my monthly quota was being used a lot faster than what traffic accesses my rented dedicated server normally. After a lot of tracking, tracing, research and talking with other people I know that also host games a-like Quake 3, such as Urban Terror, and Padman. I soon learnt that I was being DDoS'ed, and blocking all incoming and outgoing ports did not solve the issue, It still managed to get through the many Firewall's that I had in place. I would of left it however in Australia server-hosting is very high priced, and so is data allowance, and is charged at very high price per GB used over your limit.
So, After battling the issue for a while, I ended up changed provider, and ran it from there, I was safe for about 2 months, until the DDoS attacker found me on the master server's listing, even though I blocked the ports again it still didn't stop the attacks, so at an additional cost I got installed a Hardware Firewall, of which worked, and I have not had any DDoS issues since, however, even though it is not directly affecting me, it has caused my dedicated server to have higher pings (10-20ms higher) and occasional lag spikes
Anyone that is playing on other game services, get a huge lag spike for a few seconds every so many minutes, I have contacted my provider about it, and they said there is nothing they can do, the DDoS attack has affected the entire node that my server is hosted on, and it is "out of their hands".
After all of this, More research shows that there is a way of fixing the DDoS attacks, but can only be done using IPTables on Linux. I use Windows Server, so Iam very new to Linux, and will be learning it so I can use IPTables to stop this issue. Here on The Open Arena Forums, I was just putting out the question for general interest if this DDoS issue exists in this game, being very much related to Quake 3 Arena, even games as far as Call of Duty, which was also made with the Quake 3 Engine, it also has the issue too.