步骤：

• sudo apt-get install xinetd telnetd     安装成功后，系统会显示有相应得提示
• sudo vim /etc/inetd.conf  并加入内容:  telnet stream tcp nowait telnetd /usr/sbin/tcpd /usr/sbin/in.telnetd
• 输入sudo vim /etc/xinetd.conf并加入内容：

# Simple configuration file for xinetd

# Some defaults, and include /etc/xinetd.d/

defaults

  {

    # Please note that you need a log_type line to be able to use log_on_success

    # and log_on_failure. The default is the following :

    # log_type = SYSLOG daemon info

    instances =

    log_type = SYSLOG authpriv

    log_on_success = HOST PID

    log_on_failure = HOST

    cps =

  }

  includedir /etc/xinetd.d

• sudo vim /etc/xinetd.d/telnet并加入以下内容：

# default: on

# description: The telnet server serves telnet sessions; it uses \

# unencrypted username/password pairs for authentication.

service telnet

  {

    disable = no

    flags = REUSE

    socket_type = stream

    wait = no

    user = root

    server = /usr/sbin/in.telnetd

    log_on_failure += USERID

  }

• 重启机器或重启网络服务sudo /etc/init.d/xinetd restart
• telnet localhost 23 测试