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nmap (<a class="moz-txt-link-abbreviated" href="http://www.nmap.org">www.nmap.org</a>) is the defacto standard port scanner in the
linux world. It has also been ported to Windows and has a GUI
front-end to make it a little more palatable for people less
familiar with command line arguments. Very powerful. Not for the
faint at heart.<br>
<br>
Wireshark (<a class="moz-txt-link-abbreviated" href="http://www.wireshark.org">www.wireshark.org</a>) might also prove useful to you. Hugely
powerful, it can provide huge insights into how your network
operates.<br>
<br>
These tools have been actively developed for years and are very well
supported.<br>
<br>
People have made careers out of support at this networking level; it
can become rather complex. However, if you can get at least a basic
understanding of how your network really operates, the
knowledge/experience can be very valuable.<br>
<br>
Two cents,<br>
Chad<br>
<div class="moz-signature">______________________________<br>
<b>Chad Neeper</b><br>
<small>Senior Systems Engineer</small><br>
<br>
<b>Level 9 Networks</b><br>
<small>740-548-8070 (voice)<br>
866-214-6607 (fax)</small><br>
<br>
<small><small><i>Full LAN/WAN consulting services -- Specialized
in libraries and schools</i></small></small></div>
<br>
On 2/23/2012 10:58 AM, Mike Hensel wrote:
<blockquote cite="mid:001301ccf244$08d2ea80$1a78bf80$@oplin.org"
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<p class="MsoNormal">OPLIN Techies:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m looking for suggestions on Network Port
Scanner software (preferably freeware) to check our network
for vulnerabilities. Any suggestions would be appreciated.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Mike Hensel<o:p></o:p></p>
<p class="MsoNormal">Director, MLIS<o:p></o:p></p>
<p class="MsoNormal">London Public Library<o:p></o:p></p>
<p class="MsoNormal">20 E. First Street<o:p></o:p></p>
<p class="MsoNormal">London, OH 43140<o:p></o:p></p>
<p class="MsoNormal"><a moz-do-not-send="true"
href="www.mylondonlibrary.org">www.mylondonlibrary.org</a><o:p></o:p></p>
<p class="MsoNormal">740-852-9543<o:p></o:p></p>
<p class="MsoNormal">Mobile 614-325-1429<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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