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I find a lot of sources explaining how to get rid of the following message:

RTTVAR has grown to over 2.3 seconds, decreasing to 2.0

But

  • What exactly is RTTVAR(Round Trip Time Variance)?
  • What is happening here?
Jithin Pavithran
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    When tcp is used the sender needs a retransmission timeout, to know when data needs to be resended if it got lost. The retransmission timeout (RTO) is calculated from two variables: the estimated Smoothed Round Trip Time (SRTT) and its variance (RTTVAR). You can read everything else in RFC 6298. – Tom K. Aug 02 '18 at 14:48
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    RTTVAR is not specific to nmap and is a TCP thing. – schroeder Aug 07 '18 at 18:56

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