You can try out a software called iMON that can continously monitor a specific Host (that exists either inside the network or outside the network). Alerts may be set, and much more. iMON is a comprehensive server/application monitoring and administration solution that can monitor crucial aspects of your server, application and network environments. A 15-day trial version is available at www.eIQnetworks.com. I'm sure you'll find it useful.

Hope this helps-
George.