Intrusion Detection on my WordPress server

A customer is moving their WordPress hosting to me.  Their site is already being attacked with what amounts to DOS attacks.  One IP will get 50+ connections at a time.

I want a system that will recognize this kind of activity and block it.  Or at least alert someone with the IP to block.

We're talking about a LAMP system ... so ... what would you recommend?

Thanks!
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Daniel WilsonAsked:
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Neil RussellTechnical Development LeadCommented:
I would recommend that you advise your customer to use a professional hosting company that understands the business of hosting.  
The best advise you should ever offer to a customer is the advice that is BEST for THEM regardless of you making money on the deal or not.  If you are not currently hosting to a degree that allows you to understand such things then I would say that you are potentially putting your customer at risk.

No offence meant but sometimes we have to admit that we can not be EXPERTS in every field and offer advice on where a customer can best be looked after.
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erzoolanderCommented:
Agreed with the above.  I would turn down the business for those reasons.

If, however, you're determined to take them on, you could start with something like mod_evasive.

http://www.zdziarski.com/blog/?page_id=442
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Daniel WilsonAuthor Commented:
Thanks for some suggestion beyond "if you don't know, I won't tell you".
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