it wasn't that big, just a troll posting an anti-DCS picture like fifty times and then making me lose track of which threads got actual content-posts added to them and which were just trolled
Thats weak. A troll should take pride in his or her work, and use a variety of creative tactics to irrate people.
As for stopping them I can tell you that banning ip addresses doesn't work as its fairly easy to change your ip address even if it is suppose to be a static one.