Oh, thanks ss2chef, I'm checking your recommended sites.
My company locates in Singapore, and has its servers put at the SingTel site. Thus, engineers in my company need to do remote control to the servers everyday if they want to check or modify the database, customer database, billing database... Besides the database servers, there are other servers with different functions.
My company is working in the telecommunications field. When customers use the service, the Call Server will check their subscription by looking for their information in the customer database, and so on, ... and then direct the calls to the destination Call Server. Thus, I also need to check the availability of the Call Server. For example, when the Call Server is down, I should be alerted. That is one of the function I'm supposed to design.
I was given the network topology, but the drawing is not very clear. And from the drawing, I know that the network is built as logically bus-topology
Thanks for any comments and help