If it's a response of previously spoofed send SYN then it must've been SYN+ACK, and 
you can specify on your Firewall or Router to deny those SYN+ACK packets which have 
not been initialized from your Network.

Raw Diagram would be:

SYN+ACK -> (check if your network requested it) -> (if yes) -> then -> ALLOW 
-> else (REJECT)

Regards, 
---------
Muhammad Faisal Rauf Danka

Chief Technology Officer
Gem Internet Services (Pvt) Ltd.
web: www.gem.net.pk

Vice President
Pakistan Computer Emergency Responce Team (PakCERT)
web: www.pakcert.org

Chief Security Analyst
Applied Technology Research Center (ATRC)
web: www.atrc.net.pk

--- "NetWatch" <[EMAIL PROTECTED]> wrote:
>>SNIP>>


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