A unique simple way to OS fingerprint with no tools, this can be done using the TTL value of a ping packet, TTL is time to leave, this is the number router hops a packet can take before any other router can stop routing it. When the value gets to zero
|OPERATING SYSTEM||TTL SIZE|
|Cisco / Network||255|
Watch the TTL Values 😉 the sites above were picked at random as an example of varying TTL values, there is no particular interest in the sites themselves.