When I left my institution for a long vacation, I did'nt leave any blueprint behind about the network. All I know is, I could do the job done whether I'm here or there. Well, I was right. controlling remote PCs with SSH (Secure Shell) did a hell of a job. It is simple and yet so powerful.
Our network comprises of web proxy servers stationed in each building. We called these, child proxy servers because they connect directly to their big Mama and Papa called parent web proxy servers. One day, a child proxy got sick, so whom did they call? Me, right here in Singarpore job hunting. I told them not to panic, so I brought up my Putty, a client program for the SSH, Telnet and Rlogin network protocols and quickly login and diagnosed. I did that just after verifying connectivity with ping (packet internet groper). What happened? Luckily, it was a just a layer 1 problem. Layer 1 is the first, or bottommost, layer of the OSI Reference Model usually referred as the physical layer. It is where we usually find the wires (UTP, coax, fiber), connectors (RJ-45, DB-9), hubs and repeaters. Then, how come I was able to connect using SSH? Simple, one side (Internet) of the connection was good, but the other (LAN) was not.
As long as there's a route and access to the destination, controlling remote PCs will be an easy task to do. So there, SSH saved the day.
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