![]() You can scan multiple hosts through numerous approaches: This feature comes in real handy when you are managing vast network infrastructure. Nmap has the capability of scanning multiple hosts simultaneously. However, an aggressive scan also sends out more probes, and it is more likely to be detected during security audits. > nmap -A Īggressive scans provide far better information than regular scans. ![]() You can use the -A argument to perform an aggressive scan. ![]() Nmap has an aggressive mode that enables OS detection, version detection, script scanning, and traceroute. Nmap will display the confidence percentage for each OS guess.Īgain, OS detection is not always accurate, but it goes a long way towards helping a pen tester get closer to their target. You can use the additional flags like osscan-limit to limit the search to a few expected targets. Nmap will also try to find the system uptime during an OS scan. ![]() In addition to the services and their versions, Nmap can provide information about the underlying operating system using TCP/IP fingerprinting. Do keep in mind that version scans are not always 100% accurate, but it does take you one step closer to successfully getting into a system. Nmap will provide a list of services with its versions. To do a version scan, use the ‘-sV’ command. You can then use it to attack a machine using an exploitation tool like Metasploit. It makes your life easier since you can find an existing vulnerability from the Common Vulnerabilities and Exploits (CVE) database for a particular version of the service. Version scanningįinding application versions is a crucial part in penetration testing. Remember, stealth scanning is slower and not as aggressive as the other types of scanning, so you might have to wait a while to get a response. You can use the ‘-sS’ command to perform a stealth scan. However, a stealth scan never completes the 3-way handshake, which makes it hard for the target to determine the scanning system. If SYN/ACK is received, it means the port is open, and you can open a TCP connection. Stealth scanning is performed by sending an SYN packet and analyzing the response. These ports are the ones used by popular services like SQL, SNTP, apache, and others.
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