title: How to make NMAP command steady and the fastest possible?
body: <p>I want to make an IP scan using NMAP, but the operating time varies for some reason. The command can be executed in 2 seconds, an if I launch it again just after, it can take 30 seconds.</p>
  
  <p>This is the command I use :</p>
  
  <blockquote>
    <p>nmap -n -sn -T5 --max-rtt-timeout 1s</p>
  </blockquote>
  
  <p>-n : no DNS resolution</p>
  
  <p>-sn : disable port scan</p>
  
  <p>-T5 fast mode</p>
  
  <p>--max-rtt-timeout round trip timeout for the probes 1s</p>
  
  <p>I don't know if my optimisation is good ? And how to make it better ?</p>
  
  <p>Thank you</p>