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How-To: Methods for monitoring routers and WAN connections.
Many customers have asked how to monitor routers and/or the availability of wan connections. Primarily, for the single purpose of being alerted if the remote router is not accessible.
The simplest method to use is PING. (ICMP-Ping)
In our example, we have a WAN connection where the local router is 10.1.1.1 and the remote router on the other side of the WAN is 10.2.2.1. We want to create an entry to monitor whether or not we can reach 10.2.2.1 Obviously, we don't care about 10.2.2.1 if 10.1.1.1 is not accessible, so we will be creating a dependency here as well.
Here is the most basic configuration to accomplish this task.
Select Options from the Edit menu.
Select the Server/Machine Monitoring Tab.
Hit the Add button to add a new entry to the list.
Enter a unique name in the Name field.
Enter a meaningful description
Enter 10.2.2.1 in the IP Address field.
Enter ICMP-Ping in the Port field.
Enter 2000 in the Timeout field (milliseconds)
(Configure any alerts desired)
Hit the OK button to save the information.
--- Now, add the local router ---
Perform steps 1 through 8 above.
Change the IP Address to 10.1.1.1
Select the name of the entry for 10.2.2.1 in the Depends On field.
(Configure any alerts desired)
Hit the OK button to save the information.
The above configuration ensures that both 10.1.1.1 and 10.2.2.1 are responding as well as making sure that our WAN link is up ( 10.2.2.1 only accessible if WAN is up). Also, IPSentry will not attempt to access 10.2.2.1 if 10.1.1.1 is not responding thereby avoiding alerts that may dispatch support persons to the wrong router.
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