Some more information that I found while doing my investigation yesterday. I was playing Caxos' Military RP and it got really popular. He said that it was hosted on BLG, and he got this message when it started to happen:
Now, I am not familiar with BLG hosting, so this may even be a normal message that everyone gets, I am not sure.
After this he said he was being pinged by various IP addresses, the server was lagging horribly, but it never actually crashed completely. He even said that his internet was down for a solid minute. This might be normal considering his server was BLG dedicated, and that could explain why it didn't go down completely. We were still able to talk to each other and while everyone else on the server lagged out, Caxos and I were still connected.
Maybe they are getting the IP's from Glass hosting, through an exploit?
Also, I forgot to mention that the attacks only lasted for a definite amount of time before they stopped completely, this was evident when I did my investigation yesterday and while the notes say it lasted for almost 12 minutes, they were functioning normally again after 10. Also, Caxos said that his internet went down for a solid minute. Could be the program they are using?