Zenmap ubuntu 20.04 update#
script-updatedb: Update the script database. script-trace: Show all data sent and received script-args-file=filename: provide NSE script args in a file script-args=: provide arguments to scripts version-trace: Show detailed version scan activity (for debugging)ĭirectories, script-files or script-categories version-all: Try every single probe (intensity 9) version-light: Limit to most likely probes (intensity 2) version-intensity : Set from 0 (light) to 9 (try all probes) sV: Probe open ports to determine service/version info port-ratio : Scan ports more common than r: Scan ports consecutively - don't randomize F: Fast mode - Scan fewer ports than the default scan exclude-ports : Exclude the specified ports from scanning dns-servers : Specify custom DNS servers n/-R: Never do DNS resolution/Always resolve PE/PP/PM: ICMP echo, timestamp, and netmask request discovery probes PS/PA/PU/PY: TCP SYN/ACK, UDP or SCTP discovery to given ports Pn: Treat all hosts as online - skip host discovery sL: List Scan - simply list targets to scan Ideally, to learn more about these, use the following command to bring up the list of commands and optional flags that can be used with your scans. Overall, Nmap has many features and combinations.
This method is used for DDoS but on a large scale with botnets.Įxample: nmap -sS or Nmap Help This type of scan is referred to often as half-opened connections scan, and it never fully completes. Initiate TCP SYN scan (SYN/Connect()/ACK/Window/Maimon).
Some commonly used ports will not get much information, but others known to use specific uncommonly shared ports will show far better results if they are open.Įxample: nmap -sV or TCP SYN Scan Initiate a services scan that instructs Nmap to check what services on being run on the target by investigating the open ports. This is done by adding the -p flag.Įxample: nmap –p 80,443,8080,9090 or Services Scan Initiate a custom port scan, and this can be useful for checking specific ports that are not covered in the top 1000 common ports for each protocol. If the target address is locked down and ports are filtered or closed, the results will be less than reliable to downright useless (good result).Įxample: nmap -O -osscan-guess or Port Specification and Scan Order Initiate an operating system scan that instructs Nmap to try and figure out what operating system is run on the target system.