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This question already has an answer here:

I am having trouble determining what values I should set my rate-limit to. The only example I have seen is this ...

    rate-limit {
            responses-per-second 5;
            window 5;
    };

... is that too tight? Can it cause problems for my clients? This is suppose to help defeat amplification attacks right?

Thanks!

merged by Iain Mar 22 '13 at 6:24

This question was merged with Bind DNS rate-limit and values for responses-per-second and window because it is an exact duplicate of that question.