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Port Scanning
Port Scanners are used to
increase the security of the network. Port scanning can be
done inside your network to test various servers and
workstation or it can be done from outside your network to
determine what services can be accessed from the internet
through your firewall. It is used to determine services that a
computer is running and shut down services not being used to
increase the security of the computer being scanned and
determine the vulnerabilities of the services that are being
run in the computer being scanned
Internal
and External Port Scanning
There are some
security service providers that will scan your network
from the internet to test for open ports and
vulnerabilities on your servers. They may provide a
printed or electronic report on the results outlining
your vulnerabilities and giving recommendations about
how to fix them. Many of these services are very
useful especially since they stay current with current
vulnerability information and update their software
regularly to test for new vulnerabilities.
Even if you hire
someone to scan your network from the outside, you
should still scan your network with your own scanning
tools from the inside. Please note that before
scanning or sniffing your network, even as a network
administrator, you should always get written
permission from your management first up to the level
of your CIO. This to avoid prosecution should someone
decide they do not like information being scanned.
Also be sure you do not scan when system crashes due
to scans could cause loss of data or interfere with
work.
If you scan your
network, you should scan specific parts of your
network rather than the whole network at one time. I
would recommend that you scan and secure your servers
first, but do not do this during normal business hours
when your server usage is at a peak. Also you may want
to warn your users before a scan is done that some
service interruption may occur due to system
preventative maintenance.
Port
Scanners
There are many port
scanner types some of which may identify
vulnerabilities along with ports that are being
serviced. Links to port scanners can be found at http://www.techtutorials.info/nsectools.html
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Related Topics on Computer and
Information security
- Software
Vulnerability Control
- Firewall Protection
- Network
Intrusion Detection
- Network Port
Scanning
- Network Tools
passwords
- Types of attacks
- Application
Level Protection
- Systems Protection
- Mail and Security
- Hostile Software
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