It is assumed that the file will be read after nmap completes, so estimated completion times and new open port alerts are redundant to the actual completion time and the ordered port table. These same rules are used to classify the device types in version detection How to use the firewalk nse script
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Ndiff is a tool to aid in the comparison of nmap scans
Specifically, it takes two nmap xml output files and prints the differences between them
Hosts coming up and down, ports becoming open or closed, etc. As stated in the section called “device and os classification (class lines)”, every reference fingerprint is classified with one or more device types This list contains the device types used by nmap and the criteria for classifying a device as each type
