What is procedure for stopping robots and malicious scanners that slow down a site?

Posted by zsharp on Stack Overflow See other posts from Stack Overflow or by zsharp
Published on 2010-03-30T01:03:44Z Indexed on 2010/03/30 1:13 UTC
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What should i do to prevent users from running scanners or auto posting robots against my site that would slow down the site processing?

Is it sufficient to timestamp each post a user makes and create a posting delay? How long of an interval should there be?

What else can I do besides te above and captchas on form posts?

thanks

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