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What you are describing is really not a DOS (denial of service) attack.
It's just a spam attack.
I've run into the same problem lately. The way I've had to deal with it is to not allow any comments (even from registered users) to News posts.
I do end up with a bunch of unapproved (pending) comments to news posts, but at least I don't have a site full of spam this way.
Hope this helps,
Terrion
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