Time for Another Stupid Newbie LJ Question

[the_other_sandy]

I just got my first ever spam comment (on a post I made back in July). I know how to delete comments, but I'm pretty sure I've seen some people mention there's a way to block certain IP addresses from commenting in order to prevent this kind of thing from becoming a problem. Does anybody know how to do that?

Comments

[wraithfodder.livejournal.com]

Well, darn, I banned someone but they were a name user. Actually found the listing, but can't recall how I did it. You can screen anonymous users; I do that after one trollish remark full of bad language.