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Syn Flood attacks

My Sonicwall is getting "Syn Flood Attack" alerts.  I think that I know what this is but I dont know how to prevent it.  I think that it is making my web server slow.  If someone knows a solution please share it with me
Jared
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The--Captain
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A sniffer in front of the sonicwall should reveal if this is just normal background noise or actual traffic with which you should be concerned.

Cheers,
-Jon
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Any suggestiong a easy to use sniffer?  I don't have any experience working with one.
Jared
Ethereal seems fairly popular...

Cheers,
-Jon
I downloaded and installed Ethereal.  Makes little sense to me.   When you say just normal background noise and actual traffic. How would I know the difference?
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