ubuntu实现telnet的方法：
1.在终端输入：“sudo apt-get install xinetd telnetd”
2.安装成功后，系统也会有相应提示，并输入以下命令：
sudo vi /etc/inetd.conf并加入以下一行
telnet stream tcp nowait telnetd /usr/sbin/tcpd /usr/sbin/in.telnetd
3. 输入“sudo vi /etc/xinetd.conf”并添加以下内容：
# 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
4. 再输入：“sudo vi /etc/xinetd.d/telnet”并添加以下内容：
# 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
}
5. 重启机器或重启网络服务:
sudo /etc/init.d/xinetd restart
6. 使用TELNET客户端远程登录：
ifconfig -a //显示本机地址
