how to install/configure TELNET (plz don't advice abt SSH)
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The reason Telnet is being phased out in favor of SSH, is simply for security (in example, stopping man-in-the-middle attacks, or generic spying, by encrypting your data streams and tunnels).
My thinking is that you just have to do the few steps described in the above link, and just make sure the permissions for that user are strapped down. Telnet was just a service built on NCP (later moved to TCP/IP) to allow remote login sessions.
how to configure TELNET daemon for fedora core 5? I wanna connect to this from my other Linux box (fedora core 2).
Will I be able to login as root using TELNET from my Linux Client (fedora core 2) to the Server (box with core 5) ?
FC5 and FC2 are ancient. The latest is FC10....I'd definitely upgrade, due to a slew of security-related fixes that have gone in between then and now in general.
You can try to download and install the telnet package, but I'm not even sure the latest version is available for FC5 or 2. Allowing root to log in remotely is an ENORMOUS security risk, especially over telnet. Anyone on the network can VERY easily grab your root password.
There's lots of reasons people use SSH over telnet....