We have 106 routers scattered around Canada and USA, Model of the router is Cisco VPN 17xx Series. The ethernet interface act as an WAN interface which connects directly to ISP DSL modem. In case of DSL outage we have an alternate interface ( dialer interface) which uses build in modem to keep the WAN connectivity intact. In very simple term when DSL is down, dial back up thorouh PSTN line works as an WAN connection. Now the problem is that we would like to test these dialer (dial back up ) interface to make sure when DSL is down they are operational mean they are able to use the modem to dial out. In order to do that we need to ping the dialer interface to check if they are funtional even though dial back wont be use for months since DSL is funtional.
What's the most convenient way to test these interfaces basically all i want to do is to ping those interface one by one and get the result back if ping is succesfull or not.