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When to Run a
Remote Login Server
The principal reason for running a remote
login server is to let users run arbitrary text-based programs from other
computers. You might want to make the computer accessible from distant
locations (potentially even somewhere on the other side of the planet), or to
allow several people to log in and use the system simultaneously. A single
Linux computer can support anywhere from one to thousands of simultaneous
users, depending upon the programs they run and the hardware used in the
computer. As a general rule of thumb, a user load in the dozens on reasonably
modern hardware is probably not excessive, so long as users don't need to use
extremely resource-intensive programs.WARNING
align=left border=0> Remote login servers are unusually
sensitive from a security point of view. If a miscreant somehow obtains a
username and password for a computer that runs only, say, a Post Office
Protocol (POP) server, and if the POP server has no security flaws, the
miscreant won't be able to do serious harm to the computer. Of course, the
e-mail the miscreant might read could be sensitive, but in terms of harm to
the computer, the impact is minimal. With remote login access, though, the
miscreant has the opportunity to exploit any bugs or flaws that might exist
in dozens or hundreds of other programs, and thus do serious damage. For this
reason, it's particularly important that you configure your remote login
servers carefully, and diligently guard the passwords for computers that run
such servers. If you aren't using a remote login server on a computer, you
should disable it, even if you're using other
remote login servers.
