p0f: p0f - passive os fingerprint tool
p0f: 
p0f: p0f is a passive operating system fingerprinting tool.  It can 
p0f: identify the OS on machines that connect to your box, machines you 
p0f: connect to, machines you cannot connect to, and machines whose 
p0f: communications you can observe.  It can detect or measure firewall 
p0f: presence, NAT use, existence of a load balancer setup, the distance 
p0f: to the remote system, its uptime, and its network hookup and ISP.
p0f: 
p0f: Homepage: http://lcamtuf.coredump.cx/p0f.shtml
p0f: