Two type of rate limiting for based on IP address

[Quintin Par]

Hi all,

 How can I maintain two rate limit strategies?One for spiders and one for
regular users?

I can get the IP address list of spiders from

http://www.iplists.com/ . Can I separate it by geo? Have people attempted
this?

My website is being pounded by some screen scrapers and I want to block
them, but not at the risk of blocking search engine spiders.

-Quintin
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