Portscan
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#nmap -sF 192.168.1.18 <- For Linux Boxes (if show ports and not with -sT, the linux box is running a FW)
#nmap -P0 -sS 192.168.0.1 <- For Windows Boxes (sometimes will crash them)

Xmas scans -> URG, PUSH, FIN

FTP Bounce scan: #nmap -b ftp.merc-int.com -P0 -p 80 -T4 -vv www.yahoo.com


Resource:
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http://members.dodo.net.au/~ps2man/Nmap/nmap.html