[ratelimits] rate limiting options for large recursors

[William Taylor]

I was wondering if anyone could recommend some starting rate-limit options
for large recursors. Any insight would be most appreciated.

Right now to test with I have this:

        rate-limit {
                responses-per-second 100;
                window 5;
                ipv4-prefix-length 32;
                log-only yes;
        };


Thanks,
 William