hping3 -i u1 -S -p 80 [IP ADDRESS]
Use that for a SYN flood test. "man hping3" for a complete overview of the arguments and explanations.
EDIT: You can also use hping3 --faster -S [IP]
NOTE: Malicious use of SYN flooding is illegal. I am not condoning illegal activity; you mentioned about testing your server, which is fine.
Last edited by corp769; 02-15-2011 at 01:49 AM.
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