You can use PRTG to do a basic monitoring of your Cisco Wireless LAN Controller (WLC).
On this example, I'm using the free PRTG Version (which supports up to 100 sensors for free) to monitor:
- number of active wifi users
- WLC Uptime
- WLC Gigabit interface traffic
- basic Ping monitoring
To do it, you just need to enable the SNMP on the WLC (menu Management > SNMP > Communities > Create (or Edit) public):
Then, enable the SNMP on the PRTG for this device:
To monitor the system uptime, interface traffic and ping, you just need to run a "Recommend Sensors" now, and it will offer you those (and maybe more sensors).
I wasn't able to find the number of Wifi users automatically, so I had to add it manually.
To do it, add a SNMP Custom sensor: Add Sensor > SNMP > SNMP Custom String:
On Sensor Name, type "Number of Wifi Users" or other information. Then, on "OID Value", type: 22.214.171.124.126.96.36.199.6188.8.131.52.0
Save it and wait some time until the first results on PRTG screen.
Very simple and useful. Now you can have a history of users on your wifi network.
To check if the information of the first image is correct, you can double check on the WLC also: