Install nmap if you don't already have it on your Linux computer. Run "sudo apt-get install nmap" on Ubuntu, or "sudo dnf install nmap" on Fedora. To do a quick scan of your network and discover the ...

Nmap is an essential tool for anyone who's serious about network security. It can be installed on any Linux distribution. The nmap command (short for network mapper) is a network exploration/security ...

How can you be sure your network is secure? Before you can patch vulnerabilities you need to discover them. You need to think like a cracker might. You need to hack your own system. This is known as ...

IntroductionIn the previous second installment, we learned about IP addresses, ports, and how TCP/UDP works. This time, we will use that knowledge to look at your own server from the perspective of an ...

If SSH is the Swiss Army knife of the system administration world, Nmap is a box of dynamite. It's really easy to misuse dynamite and blow your foot off, but it's also a very powerful tool that can do ...

Knowing what services are running on your systems, and being able to identify if and when any of those services change, is the first step in securing your netwsork. Many tools can accomplish this, but ...

The great thing about tools is that you often can misuse them for a completely different purpose. The end of a screwdriver makes a passable hammer; a butter knife can be a screwdriver, and even a ...

Creating a system inventory is a common task for system and network administrators. Information security specialists often need inventories as well. Even in shops that have inventory tools, a method ...