Here is a nice writeup showing how to do passive OS fingerprinting without any tools: http://www.netresec.com/?page=Blog&month=2011-11&post=Passive-OS-Fingerprinting
Here is a nice writeup showing how to do passive OS fingerprinting without any tools: http://www.netresec.com/?page=Blog&month=2011-11&post=Passive-OS-Fingerprinting
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