[mrtg] Can I have mrtg totally ignore changes in "ifDescr"?

David L Kindred (Dave) d.kindred at telesciences.com
Mon Sep 30 16:13:32 MEST 2002

I would like to monitor the "virtual" ports in a VPN appliance.  It
looks like the Appliance changes the "ifDescr" each time it
assigns/removes the "virtual" port to a user session, such that I'm
getting a lot of the following:

    Warning: There is something wrong with Target '24:community at appliance
    * Its ifDescr used to be 'remote peer is (w.x.y.z)(username)'
    * Now it is 'remote peer is ('

Changing to physical address as described in config.txt won't help this
at all.  Is there any way to tell MRTG to ignore changes in "ifDescr"?

Note: When I created the mrtg.cfg file I had "anonymized" the web page
entries for these "virtual" ports, as I don't want to display IP address
and User Name.  The mrtg.cfg entry looks like:

    Target[appliance.24]: 24:community at appliance
    MaxBytes[appliance.24]: 143750
    Title[appliance.24]: appliance (): Remote 020
    PageTop[appliance.24]: <H1>Traffic Analysis for Remote 020
       <TR><TD>System:</TD><TD>vpn appliance</TD></TR>
       <TR><TD>Interface:</TD><TD>Remote 020 (24)</TD></TR>
       <TR><TD>IP:</TD><TD> ()</TD></TR>
       <TR><TD>Max Speed:</TD>
           <TD>143.8 kBytes/s (propVirtual)</TD></TR>

Note: Yes I realize that this would give me graphs with lots of
inter-mixed data, but I don't care int his case, I just want to get the
"feel" for what is happening.

David L. Kindred <mailto:d.kindred at telesciences.com>
Unix Systems & Network Administrator
Telesciences, Inc. <http://www.telesciences.com>
Support: <http://support.telesciences.com>
2000 Midlantic Drive, Suite 410, Mt. Laurel, NJ 08054
Tel: +1.856.866.1000 ext. 4184
Fax: +1.856.866.0185

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