FAQ bug
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How do I file a bug report?
Bug reports can be filed at http://issues.nmap.org/new or emailed to dev@nmap.org. Please include a description of the problem, your operating system, and the output of nmap --version.
For interface- and routing-related bugs, also include the output of nmap --iflist and nmap --route-dst <YOUR_TARGET>. You can sanitize addresses before sending.