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http://seclists.org/nmap-dev/2015/q2/68 From: David Fifield <david () bamsoftware com> Date: Wed, 29 Apr 2015 10:13:40 -0700 Previously, a Time Exceeded message meant the host was immediately marked down, even if there were other probes still in transit. Now it gets treated the same as no-response. I found that a concurrent ICMP traceroute was interfering with host discovery. Nmap was receiving and acting on the Time Exceeded messages produced by the traceroute process. This caused it to mark a host as down that actually was up.
Here is some documentation for Nmap, but these files are much less comprehensive than what you'll find at the actual Nmap documentation site ( https://nmap.org ).