Ubuntu下Telnet服务的实现方法

用很长时间了，一直不会怎么用telnet服务。现在知道了，整理一下Ubuntu下实现Telnet服务的资料，供大家学习参考。
1、安装xinetd 以及telnetd

liceven@liceven-laptop:~$ sudo apt-get install xinetd telnetd

获取：1 feisty/main xinetd 1:2.3.14-1ubuntu1 [135kB]
获取：2 feisty/universe telnetd 0.17-35ubuntu1 [42.0kB]
下载 177kB，耗时 7s (25.2kB/s)                                                
选中了曾被取消选择的软件包 xinetd。
(正在读取数据库 ... 系统当前总共安装有 123141 个文件和目录。)
正在解压缩 xinetd (从 .../xinetd_1%3a2.3.14-1Ubuntu1_i386.deb) ...
选中了曾被取消选择的软件包 telnetd。
正在解压缩 telnetd (从 .../telnetd_0.17-35Ubuntu1_i386.deb) ...
正在设置 xinetd (2.3.14-1Ubuntu1) ...
Stopping internet superserver: xinetd.
增加 `diversion of /etc/init.d/inetd to /etc/init.d/inetd.real by xinetd'
Starting internet superserver: xinetd.

正在设置 telnetd (0.17-35Ubuntu1) ...
--------- IMPORTANT INFORMATION FOR XINETD USERS ----------
The following line will be added to your /etc/inetd.conf file:

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

If you are indeed using xinetd, you will have to convert the
above into /etc/xinetd.conf format, and add it manually. See
/usr/share/doc/xinetd/README.Debian for more information.
-----------------------------------------------------------

2、配置文件

A。 /etc/inetd.conf

liceven@liceven-laptop:~$ cat /etc/inetd.conf （如果存在就不需要了）

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

B. 修改/etc/xinetd.conf

root@liceven-laptop:/etc# cat 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(插入红色部分）
instances = 60
log_type = SYSLOG authpriv
log_on_success = HOST PID
log_on_failure = HOST
cps = 25 30
}

includedir /etc/xinetd.d

C。/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
}  

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；