Snort rule for TCP Portscan and PortSweep

["Tran M. Thang" <tmthang () vncert vn>]

Hi,

Any one can help me to write snort rules for detecting "TCP Portscan and PortSweep" scan? I knew that snort has modules 
to detect types of scan. But i want to have custom rules that can use plugin snortsam to block types of scan.

Thanks  

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