Nmap on Linux
Nmap is a very powerful tool with lots of options and features to visualize your network. Check which services are running on various hosts and find suspicious malicious programs running in your network. Even though Nmap is the swiss-army knife for network scanning, most of its benefits can be gained by the average Network Administrator without diving deep in to its complications. Chances are, most of the time you will find yourself using common switches even if you know all of them. The basic syntax for Nmap is: nmap 192.168.0.1 the above command scans the given host with defaults - standard TCP connect method (-sT option) and known ports (those specified in the /etc/services file. You may need to scan a whole subnet, in which case you can use: nmap 192.168.0.1/24 nmap 192.168.0.* both the command would do the same here. One of the simplest scan methods that I come up with almost every day is the Ping Scan: nmap -sP 192.168.0.1 Starting nmap 3.70 ( http://www.insecure.org/nmap/ ) at 2...