![]() It was developed by Gordon Lyon in September 1997. The main purpose of this tool is to help in mapping an entire network easily and to find open ports and services. NMAP uses a combination of probe requests to discover the IP of active hosts. After the scanning is done using NMAP, we will have a list of live hosts with their open ports. NMAP also attempts to gather more information about the open ports like running services, versions, etc. How to use NMAP?Īlthough NMAP is a command-line tool its GUI version is also available named ZENMAP. Which can be easily downloaded from its official website. If you are using Linux then you can install ZENMAP using this command: Command: sudo apt-get install zenmapĪfter installation type this to open ZENMAP: Command: sudo zenmap #Difference between zenmap and nmap how to# #Difference between zenmap and nmap install# ZENMAP is a GUI version of NMAP so it is not as powerful as NMAP. But it is highly recommended to use NMAP instead of ZENMAP because it has lots of different features and also it is relatively fast from ZENMAP. NMAP also has a scripting engine that allows us to create complex NSE scripts. These NSE scripts are divided into several categories like discovery, brute, exploit, malware, etc. Nessus is a vulnerability scanning tool which is developed by Tenable, Inc. It also scans for open ports like NMAP but in addition, it also detects the running services on those open ports and gives us information that if these ports have any kind of potential security vulnerabilities which help system administrators to identify and fix those vulnerabilities. Nessus is a web-based application that is installed on our local server. It uses different kinds of plugins to identify the vulnerabilities on the targeted machine.Īt the time of writing this comparison guide, Nessus has more than 159000 plugins are available which get updated in every 24 hours. #Difference between zenmap and nmap free#.#Difference between zenmap and nmap install#.#Difference between zenmap and nmap how to#.PE explicitly specifies one way of performing host discovery, with -PP and -PM being alternatives. sn specifies that no port scan should be performed. sn and -PE are two completely different options. So it's actually less comprehensive than not explicitly noting -PE. If no other options are specified, that is the only thing that is done. So the -PE option, if specified, means that a simple ICMP Echo request is sent, exactly as if using the ping utility on the host. This host discovery is often sufficient when scanning local networks, but a more comprehensive set of discovery probes is recommended for security auditing. For unprivileged Unix shell users, the default probes are a SYN packet to ports 80 and 443 using the connect system call. The exceptions to this are the ARP (for IPv4) and Neighbor Discovery (for IPv6) scans which are used for any targets on a local ethernet network. (For IPv6, the ICMP timestamp request is omitted because it is not part of ICMPv6.) These defaults are equivalent to the -PE -PS443 -PA80 -PP options. If no host discovery options are given, Nmap sends an ICMP echo request, a TCP SYN packet to port 443, a TCP ACK packet to port 80, and an ICMP timestamp request. The manual page on host discovery states the following: On the other hand, -PE, -PP and -PM modify exactly how the Host Discovery is performed. And -Pn skips the host discovery, performing a port scan on all hosts as if the ping scan returned successfully on all of them. sn only performs the host discovery, skipping the port scan completely. sL only lists the targets to be scanned, skipping both the host discovery and the port scan phase. The commands -sL, -sn and -Pn modify this behavior. During the second phase, the actual port scan is performed. In the first phase, called Host Discovery, all targets are pinged, to see if they are online. You see, nmap has several "phases" during a scan. 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 ![]() To answer this question, we can look at the nmap manual: HOST DISCOVERY:
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