Security Tools - Nmap - Timing

-T<N>: How aggressively (quickly) to scan. Ranges from 0 to 5.

• 0: Paranoid. Waits 5 minutes between each probe
• 1: Sneaky. Waits 15 seconds between probes
• 2: Polite. Waits 0.4 seconds between probes
• 3: Normal. Default. Includes parallelization
• 4: Aggressive
• 5: Insane

1 and 2 are useful to avoid IDS alerts.