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for protection of my web applications,from DOS,DDOS
I would also add to the above that, generally speaking, you can't effectively protect against these types of attacks at the server being targeted because the attack will still consume resources via the firewall. Instead these things need to be blocked up stream, possibly even at the ISP level.
Hmm, I suppose what "effective" means really. Certainly you can't totally mitigate them, but you can often minimize lots of the impact. I can recommend F5 ASM highly, if OP has a few tens of thousands of dollars to spare.
Last edited by acid_kewpie; 04-23-2013 at 08:17 AM.