Linux Network Information Gathering Lecture (part 1)

This lesson discusses network information gathering in Linux. Information gathering allows a programmer to know what’s happening on a network. This lesson focuses on the NMAP command. The NMAP command can be used to determine hosts on a network, identify services and fingerprint OSs. NMAP has many options, some examples include:
  • Host discovery:
    • List Scan (sL): list target to scan
    • Ping Scan (sn): disable port scan
    • Pn: treat all hosts as online, skip host discovery
This lessons also gives some examples of scan techniques:
  • Sin scan: sS
  • Connect scan: sT
  • UDP scan: sU
  • Customizes TCP scan flags: scanflags
  • Idle scan: sl
  • IP protocol scan: sO
  • FTP bounce scan: -b
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