xprobe2: Xprobe2 (Active OS Fingerprinting Tool)
xprobe2:
xprobe2: Xprobe2 allows you to determine what operating system is running on
xprobe2: a remote host. It  sends several packets to a host and analyses the
xprobe2: returned answers.
xprobe2: Xprobe2's  functionality  is  comparable  to  the OS fingerprinting
xprobe2: feature in nmap 
xprobe2:
xprobe2:
xprobe2:
xprobe2: