telnet on Linux

The telnet server (telnetd) is not installed by default on a Linux machine.
They want people to switch to ssh instead.

To install and activate the telnet daemon,
  rpm -Uvh /afs/d/software/base/linux/Redhat.Enterprise.Linux.AS-3/RedHat/RPMS/telnet-server*
  chkconfig telnet on

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This allows non-root users to telnet in.  To also allow root to telnet, comment out the
   auth       required     pam_securetty.so
line in the /etc/pam.d/login file.

Note that this file is only used/consulted when logging in from the console or by telnet.
In particular, it's NOT consulted when logging in with ssh.  Remote root login with ssh
is controlled by the PermitRootLogin line in /etc/ssh/sshd_config.  By default, root CAN
login remotely by ssh, but not by telnet.