Nmap and Network Scanning

9.

Timing and Performance Optimization

9.1.

Understanding Nmap Timing

9.1.1.

Scan Speed Factors

9.1.2.

Network Conditions

9.1.3.

Target Responsiveness

9.2.

Timing Templates (-T0 through -T5)

9.2.1.

9.2.1.1.

9.2.1.2.

Maximum Stealth

9.2.2.

9.2.2.1.

9.2.2.2.

9.2.3.

9.2.3.1.

Slow and Respectful

9.2.3.2.

9.2.4.

9.2.4.1.

9.2.4.2.

Balanced Approach

9.2.5.

Aggressive (-T4)

9.2.5.1.

9.2.5.2.

Reasonable Accuracy

9.2.6.

9.2.6.1.

9.2.6.2.

Potential Inaccuracy

9.3.

Fine-Grained Timing Controls

9.3.1.

Host Group Size

9.3.1.1.

--min-hostgroup

9.3.1.2.

--max-hostgroup

9.3.2.

Parallelism Control

9.3.2.1.

--min-parallelism

9.3.2.2.

--max-parallelism

9.3.3.

RTT Timeout Settings

9.3.3.1.

--min-rtt-timeout

9.3.3.2.

--max-rtt-timeout

9.3.3.3.

--initial-rtt-timeout

9.3.4.

9.3.4.1.

9.3.4.2.

Failure Handling

9.3.5.

Scan Delay Settings

9.3.5.1.

9.3.5.2.

--max-scan-delay

9.3.6.

9.3.6.1.

9.3.6.2.

9.4.

Performance Optimization Strategies

9.4.1.

Target Prioritization

9.4.2.

Scan Scope Reduction

9.4.3.

Parallel Scanning

9.4.4.

Resource Allocation

9.5.

Network Considerations

9.5.1.

Bandwidth Limitations

9.5.2.

Latency Effects

9.5.3.

Packet Loss Handling

9.5.4.

Congestion Avoidance

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10. Firewall and IDS Evasion