To try to push up lag times. It's a common attack and not much you can do about it.
I just moved into a new place with some roommates to start college and we got Charter internet. We all play Counter-Strike Source and since we moved in we've had problems with our internet. Whenever we all three play and get on Ventrilo to talk to people, we get huge ping spikes in game. Then when we stop talking on Ventrilo, our ping drops. It's like Ventrilo pushes it over the edge. Then sometimes when we all three play we just get random ping spikes. I've had other Cable/DSL providers at my old house with 5-6 people lanning and all playing Counter-Strike and talking on Ventrilo and nothing of the sort happened. Any ideas what may be causing this? We have the WRT54G v6 Linksys router and a Linksys Modem. (I read a few places something about the WRT54G having problems, but I don't have any other routers to test.)