[mrtg] Re: Newbie Question re: Getting Data

[Mike Mitchell]

You want the ciscoDot11AssociationMIB file.  The OID you're looking for is cDot11ActiveWirelessClients.  The numeric form is 1.3.6.1.4.1.9.9.273.1.1.2.1.1.1

Here's a perl script I use to get the count of authenticated users (not associated).  I named the script WiFiCnt, and call it from MRTG like:

Title[AP1]:         WiFi Users on Access Point AP1
Directory[AP1]:     WiFi
PageTop[AP1]:       <H1>WiFi Users on Access Point AP1</H1>
WithPeak[AP1]:      ymw
Options[AP1]:       growright,noinfo,gauge,nopercent
MaxBytes[AP1]:      2048
Target[AP1]:        `/opt/mrtg/local/WiFiCnt AP1 SSID1 SSID2`
Legend1[AP1]:       Priv
Legend2[AP1]:       UnPriv
Legend3[AP1]:       Max  Priv
Legend4[AP1]:       Max  UnPriv
LegendI[AP1]:       &nbsp;Priv
LegendO[AP1]:       &nbsp;UnPriv
YLegend[AP1]:       AP1

I install MRTG in /opt/mrtg, so you'll have to change paths to suit your installation.  Replace "AP1" with the name of your access point.  Replace "SSID1" and "SSID2" with SSIDs appropriate for your organization.
Here's the script:
============== CUT ===================
#!/usr/local/bin/perl5
#
# Given the name of a WiFi access point and SSIDs, get the number of
# authenticated to those SSIDs and then the clients authenticated to
# other SSIDs.
#
# If no SSIDs are specified, the number of associated clients is returned,
# followed by the number of authenticated clients.
#
# Usage: WiFiCnt target [SSID] [SSID] [SSID] ...
#
# Uses the ciscoDot11AssociationMIB
#
BEGIN { push(@INC, "/opt/mrtg/lib/mrtg2"); };
use SNMP_util;

$aoid = "1.3.6.1.4.1.9.9.273.1.1.2.1.1.1";      # cDot11ActiveWirelessClients
$toid = "1.3.6.1.4.1.9.9.273.1.3.1.1.2.1";      # cDot11ClientUpTime table

$hst = shift(@ARGV);
$hst .= ":::::2" unless ($hst =~ /:/);          # switch to SNMPv2

$chkSSID = ",,,,,,,,,,,,,,,,,,,,,";             # unlikely SSID to match
if ($#ARGV >= 0) {
    $chkSSID = "";
    foreach $ssid (@ARGV) {
        $tmp = sprintf("%d.%s", length($ssid),
                        join(".", map(ord, split(//, $ssid))));
        $chkSSID .= '|(' . $tmp . ')';
    }
    $chkSSID = substr($chkSSID, 1);     # remove leading '|'
}
#
# Get a table of authenticated clients. The SSID is encoded in the instance.
#
@tbl = snmpwalk($hst, $toid);
$good = 0;
$other = 0;
foreach $val (@tbl) {
    if ($val =~ /$chkSSID/o) {
        $good++;
    } else {
        $other++;
    }
}
# number of associated clients
($good) = snmpget($hst, $aoid) if ($#ARGV < 0);

print "$good\n$other\n";
============== CUT ===================

-----Original Message-----
From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch] On Behalf Of chastaib at genco.com
Sent: Friday, May 14, 2004 12:49 PM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] Newbie Question re: Getting Data

Greetings,
     Okay, I've got MRTG up and running happily, and producing valid data.
     Now, I want MORE!
     I'm monitoring about 50 Cisco 1200 Access points.  I want to know how
many users are associated to each access point.
     I've read the faqs, I've research SNMP/MIB sites, but I'm stumped.  I
know it's possible to get that information, but I don't know how to get
there from here.
     Any help or guidance anyone can offer would be greatly appreciated.
Thanks,
Brian



--
Unsubscribe mailto:mrtg-request at list.ee.ethz.ch?subject=unsubscribe
Archive     http://www.ee.ethz.ch/~slist/mrtg
FAQ         http://faq.mrtg.org    Homepage     http://www.mrtg.org
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi


--
Unsubscribe mailto:mrtg-request at list.ee.ethz.ch?subject=unsubscribe
Archive     http://www.ee.ethz.ch/~slist/mrtg
FAQ         http://faq.mrtg.org    Homepage     http://www.mrtg.org
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi