Let’s look at some of the basic Nmap commands: Some of the Nmap switches only work when run as the root (superuser). Nmap has a huge list of command-line options, generally categorised into target specification, host listing, port specifications, service identification, scan technique, scripted scans and output options. The basic command line syntax to invoke Nmap is as follows: nmap You should ideally obtain permission from such hosting providers/server owners to carry out even “testing” probes of your own website. Ignorance will not excuse anybody from being prosecuted under the law.Īlso note that if you have a website of your own, either hosted at a hosting provider or on a rented physical server, the server and network do NOT belong to you even though you own the website’s content. As we’ll see in this article, it is a very powerful tool, and could cause disruption/damage to the target system or network.įully understand what you are doing, even with scripted scans, before you do it. Use Nmap very carefully, and only for discovery/audits of your network. Abuse of this service will be reported to the government by the site owners. Don’t forget to follow the rules listed in the Nmap man page. This permission only includes scanning via Nmap, and you are not allowed to test exploits and/or denial of service attacks. You may also scan the website for testing. Do not scan computers that you do not own, or run scans over networks that you do not own, without written permission from the owners. Under the stringent rules of the Indian Cyber Law 2000 and its further amendments till date, even a port scan on a public IP may land you in jail. Provides various interesting options to scan the network.Ĭaution: While using Nmap, be warned regarding the following information!.Can detect operating system versions (and if it’s unable to detect, it requests the user to send the scan signature to the developer, for incorporation in future versions of Nmap).Uses raw IP packets in various innovative ways for scanning.Some of its interesting features include: Nmap (Network Mapper) is a versatile open source tool, which systems administrators can’t do without. The Nmap man page describes it as a security/network exploration tool and port-scanner. This article looks at the range of functions and options it supports.
It is an exciting tool - compact and power-packed. Nmap, the network mapping tool, is the starting point when analysing any network.
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