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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>MRTG just queries what its been told to
graph, so it wont get anything like this.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Cfgmaker (the utility that generates the
.cfg files for MRTG to use) will not do this by default, but with a bit of work
it might be possible to make an interface template for your devices that pulls
out the last MAC address seen on a port. Mapping this to an IP would be a bit
more work but not impossible, though you’d probably need something
running constantly creating a mapping database?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The way we get around this here is that
our Network people set the port description to be the hostname or IP of the
device that is attached when they set up the port. This way I can use the
standard settings of cfgmaker to pull out the port description and use that for
linking to the required host.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Steve<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
mrtg-bounces@lists.oetiker.ch [mailto:mrtg-bounces@lists.oetiker.ch] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Jonathan Mast<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, 21 October 2009
4:58 a.m.<br>
<b><span style='font-weight:bold'>To:</span></b> mrtg@lists.oetiker.ch<br>
<b><span style='font-weight:bold'>Subject:</span></b> [mrtg] Auto-Discovering
IPs of Switch Ports</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>First of all, let me say
that I'm not a networking expert and my terminology is probably a little off.<br>
I have mrtg graphing a cisco switch, and it generates nice little graphs
labeled "Traffic Analysis for N -- MY-SWITCH".<br>
This is great except for the fact that I don't have (switch) port to host
mapping, all the devices are at a <st1:State w:st="on"><st1:place w:st="on">colo.</st1:place></st1:State><br>
I did run cfgmaker with each of the available ifref options, all of which
didn't help much.<br>
So my question is, can MRTG auto-discover the IP of the connected devices on
the switches ports?<br>
<br>
thanks<br>
<br>
<br>
<o:p></o:p></span></font></p>
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