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| DATE | 2015-03-06 |
| FROM | Ruben
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| SUBJECT | Subject: [LIU Comp Sci] networking class
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From owner-learn-outgoing-at-mrbrklyn.com Fri Mar 6 12:23:29 2015
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Date: Fri, 06 Mar 2015 12:26:16 -0500
From: Ruben
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http://www.linuxjournal.com/content/nmap%E2%80%94not-just-evil
I kwon a lot of you guys are taking the networking class so I ran into
this article this morning which might be useful or interesting.
~~~~~~~~~~~~~~~~~~~~~
http://www.linuxjournal.com/content/nmap%E2%80%94not-just-evil
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 jobs that are
impossible without it.
When most people think of Nmap, they think of scanning servers, looking
for open ports to attack. Through the years, however, that same ability
is incredibly useful when you're in charge of the server or computer in
question. Whether you're trying to figure out what kind of server is
using a specific IP address in your network or trying to lock down a new
NAS device, scanning networks is incredibly useful.
Figure 1 shows a network scan of my QNAP NAS. The only thing I use the
unit for is NFS and SMB file sharing, but as you can tell, it has a ton
of ports wide open. Without Nmap, it would be difficult to figure out
what the machine was running.
Figure 1. Network Scan
Another incredibly useful way to use Nmap is to scan a network. You
don't even have to have root access for that, and it's as simple as
specifying the network block you want to scan. For example, typing:
nmap 192.168.1.0/24
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