Most people only use the maximum and initial timeout values to lower them to decrease scan times, especially on filtered networks.
You can specify a minimum timeout value and a maximum timeout value as well as the initial timeout value using the - min-rtt-timeout, - max-rtt-timeout, and - initial-rtt-timeout command-line options. Timouts Nmap dynamically adjusts the timeout value to wait for a probe response based on the response time of previous probes. Some people do set the - max-paralellism to small values, such as 1, to limit the number of probes sent to a host at a time (e.g., scanning critical production systems). Since Nmap dynamically controls parallelism, these command-line options are rarely used. You can control the probe parallelism with the - min-parallelism and - max-parallelism command-line options. Nmap can dynamically adjust the number of parallel probes based on network performance. Specifying a large minimum group size increases the scanning speed. You can control the group sizes with the - min-hostgroup and - max-hostgroup command-line options. Nmap divides the target IP addresses into groups and scans one group at a time. Parallelism Nmap makes good use of parallelism for performance optimization. Keep in mind that the paranoid template scans only one port at a time, and waits five minutes between each probe. Some example uses of Nmap timing templates include the following: The faster templates are used on very fast networks, and although they are very fast, they may be less accurate. The slower templates lower the impact on the network and systems and are used for Intrusion Detection System (IDS) evasion. By default, Nmap scans with a the normal template (-T3).
The timing templates are paranoid (0), sneaky (1), polite (2), normal (3), aggressive (4), and insane (5). Timing templates may be specified by their name or numerical value. Timing Template Nmap offers six timing templates to control the speed of the Nmap scan. Nmap timing options are addressed in the following categories: ■
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