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This morning we had a crawler going nuts on our server hitting our site almost 100 times per second.

We'd like to add a protection for this.

I guess I'' have to use HttpLimitReqModule but I don't want to block allow google/bing/... How should I do it ?

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Use Arno's Iptables scripts with enabled IDS plugin. It will do the job for you. Link

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Also you can use ngx_http_limit_conn_module

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