Solution of Port2Determine the possible operating system type of all hackingarena servers using the TCP TTL value!
With traceroot (tracert) we can determine the distance (network hops) between the server and our client. The ping shows us the arriving TTL value from the server.
We can calculate the starting TTL of the server by the sum of the hop distance and the arriving TTL.
Server start TTL = 57+7 = 64.
This is the same for all the other hackingarena servers.
Using the list below, the operating system types can found with 64 starting TTL value.