ubuntu14.04中安装telnet客户端 （亲测）

一、首先查看telnet运行状态

#netstat -a | grep telnet

     输出为空，表示没有开启该服务

二、安装openbsd-inetd 和 telnetd

apt-get install openbsd-inetd
apt-get install telnetd

三、sudo vi /etc/inetd.conf 并加入以下一行

telnet stream tcp nowait telnetd /usr/sbin/tcpd /usr/sbin/in.telnetd

四、sudo vi /etc/xinetd.conf 并加入以下内容：

# 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 = 60
log_type = SYSLOG authpriv
log_on_success = HOST PID
log_on_failure = HOST
cps = 25 30
}
includedir /etc/xinetd.d

五、sudo vi /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  www.2cto.com  
user = root
server = /usr/sbin/in.telnetd
log_on_failure += USERID
}

六、重启ubuntu 即可。