Performance

Timeouts

default scan

sudo nmap 10.129.2.0 -F

optimized RTT

sudo nmap 10.129.2.0 -F --initial-rtt-timeout 50ms --max-rtt-timeout 100ms

note: setting a small initial RTT can cause of scanning less ip's, for the price of a faster scan.

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Max Retries

default scan

sudo nmap 10.129.2.0/24 -F | grep "/tcp" | wc -l

reduced retries

sudo nmap 10.129.2.0/24 -F --max-retries 0 | grep "/tcp" | wc -

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Rates

default scan

sudo nmap 10.129.2.0/24 -F -oN tnet.default

optimized scan

sudo nmap 10.129.2.0/24 -F -oN tnet.minrate300 --min-rate 300

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Timing

First Tab

-T 0 / -T paranoid

-T 1 / -T sneaky

-T 2 / -T polite

-T 3 / -T normal (default in not specified different)

-T 4 / -T aggressive

-T 5 / -T insane

insane timing script

sudo nmap 10.129.2.0/24 -F -oN tnet.T5 -T 5

note: the more agressive the scan, the bigger chance we will be blocked bcs of sending a large amount of traffic.