You may have heard horror stories about how easy it is for evil system crackers to probe potential victims' systems for vulnerabilities using software tools readily available on the Internet. The bad ...

[b]modem scan nmap[/b][b][/b] sudo nmap -v -O --osscan-guess 192.168.0.1/24 map scan report for 192.168.0.8 Host is up (0.0070s latency). Not shown: 999 closed ports PORT STATE SERVICE 5555/tcp open ...

A number of weeks ago, I provided and described a script that uses nmap to quickly scan a system or subnet for activity on a particular port. Useful for detecting, say, web servers or Oracle ...

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 ...

(With -T1 it's 217sec). So -T5 helps but it's still very slow. An online port scanner like grc.com can find a port over the internet faster. I was hoping it could do ...

So far, in my previous articles on Nmap, we've looked at how the scanner can be used to map and audit a network, as well as track down noncompliant devices and services. But hackers can also use Nmap ...

Discovering hosts and services isn't just something that hackers do. A good sysadmin needs to work with an up-to-date view of the systems they manage or those they want to keep an eye on. You have to ...

With the release of the much-awaited Linux 2.4.0 kernel early this year, GNU/Linux received a major boost toward entering the realm of enterprise-class operating systems. Several areas of the kernel ...

If you're smart and you're connected to the net, you're concerned about computer security. Open ports on your computers are invitations to criminal hackers and other evildoers to wreak havoc - and if ...