I have a Cisco modem that supports IPSLA. Can PRTG check if the internet connection is still up and running?

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This can be done using the Cisco IP SLA sensor with the following configuration on the device itself. Simply execute the following commands on it: 

Conf t
ip sla 1
  icmp-echo 8.8.8.8
  timeout 10000
  frequency 30
ip sla schedule schedule 1 life forever start-time now

A little information on the commands:

  • icmp-echo 8.8.8.8
    This will ping the google DNS server.Enter anything you like to check connectivity
  • timeout 10000
    If no reply within 10 seconds, this will trigger the PRTG sensor to goes down
  • frequency 30
    This will generated ping every 30 seconds
  • ip sla schedule schedule 1 life forever start-time now
    This is to enable IP SLA service, if not configured PRTG sensor will not work

    When this is done, simply create a new IP SLA sensor on the device and select the echo option. Now, when the address doesn't respond in a timely manner (10s in this case), the sensor will go down.


    Thanks to Samir Shaikh for sharing his solution! :)

Mar, 2016 - Permalink