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Starting Nmap 5.21 ( Interesting ports on 172.16.1.3: Not shown: 1707 closed ports PORT STATE SERVICE 135/tcp open msrpc 139/tcp open netbios-ssn 445/tcp open microsoft-ds 3389/tcp open ms-term-serv MAC Address: 00:1A:92:0A:62: B1 (Asustek Computer) Nmap done: 1 IP address (1 host up) scanned in 2.226 seconds Scanning for UDP ports is handled differently.
Because UDP doesn't have a handshake process like TCP, the UDP packet must be crafted in a manner that causes the operating system to respond back.
The tool is command-line based, but there are a number of graphical frontends for those who want a point-and-click experience.
It is a free, open source application available on all UNIX and Windows operating systems.Before using Nmap on UNIX type systems (LINUX, BSD, and Mac OS X), you need to obtain root privileges via SUDO to use any features that cause Nmap to create custom packets.Nmap can be run without administrative privileges, but some of the advanced scanning techniques such as SYN scanning and anything that needs to access the raw IP stack will fail.There's more to network security than just penetration testing.
This chapter discusses software tools and techniques auditors can use to test network security controls.If you execute Nmap with its default settings, and assuming you have root privileges, Nmap performs a SYN scan: Nmap sends a SYN to all of the ports listed in its services file (over 1,000 ports) and looks for a SYN/ACK response.