Usually you won't see a thing on the site since they don't necessarily try to hit a vbulletin file, they just pound the server, not the site itself, with requests. I know that the few times I've been dosed (how to you spell that?), I have not seen any increase in the number of users (well, the number of users goes down cuz no one can access the site!).

Thank you Lynn. So DDOS attacks are usually from an individual with problems or is this something an organization would employ to quell competition? Sorry to ask so many questions. I did have something like this not to long ago but my host took care of it pretty quickly. I have no idea what they did to solve this problem. LOL Now I wish I did. All I knew what that I had run out of bandwidth like two days after the first of the month and my site was taken offline by the host for excessive bandwidth. Is this a DDOS attack?

You might want to read this about them - http://en.wikipedia.org/wiki/Denial-of-service_attack Sometimes, like with twitter, there are a group of users doing it specifically because of something (in that case, they were targeting a particular user but didn't seem to care that they brought down the whole site), but sometimes they just do it for fun (like hacking sites is often done for fun).

Ah ok. Lyne Thank you . Just read the Wiki artile. Too bad there aren't has stringent laws for hackers.

Cash Money Records is a known group of individuals that DDOS (and I am not talking about the recording company)

Lots of people DDOS. It's pretty common to see it done. And there are lots of ways for people to DDOS.

If you find out who is DDOSing you just put a redirect on your domain to their site. So it will attack their site everytime they attack yours.

Will that actually work?

Someone may have already said to contact the upstream to get them to filter the attack, case should be resolved at that point.