1.安装telnet客户端
$sudo apt-get install telnet
2.安装telnet服务器
$sudo apt-get instlal telnetd
3.安装网络守护进程服务程序来管理telnet服务
$sudo apt-get install xinetd
4.修改配置文件inetd.conf
$sudo vi /etc/inetd.conf
telnet stream tcp nowait telnetd /usr/sbin/tcpd/ /usr/sbin/in.telnetd
telnet stream tcp nowait root /usr/sibn/tcpd/ /usr/sbin/in.telnetd
5.修改配置文件xinetd.conf
vi /etc/xinetd.conf
# 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
6.修改/etc/xinetd.d/telnet配置文件,注意server = /usr/sbin/telnetd,不是。in.telnetd
vi /etc/xinetd.d/telnet
service telnet
{disable = noflags = REUSEsocket_type = streamwait = nouser = rootserver = /usr/sbin/telnetdlog_on_failure += USERID
}
7.开启服务
$sudo /etc/init.d/xinetd restart8.查看服务，显示服务器正在监听
netstat -a |grep telnet
tcp6 0 0 [::]:telnet [::]:* LISTEN
9.尝试连接本机，输入用户名、密码后连接成功
$ telnet localhost
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.Linux 6.8.0-38-generic (ernest-laptop) (pts/11)ernest-laptop 用户名： tjjingpan
密码：
Welcome to Ubuntu 24.04 LTS (GNU/Linux 6.8.0-38-generic x86_64)* Documentation: https://help.ubuntu.com* Management: https://landscape.canonical.com* Support: https://ubuntu.com/pro扩展安全维护（ESM）Applications 未启用。55 更新可以立即应用。
要查看这些附加更新，请运行：apt list --upgradable启用 ESM Apps 来获取未来的额外安全更新
请参见 https://ubuntu.com/esm 或者运行: sudo pro statustjjingpan@ernest-laptop:~$
)
