ubuntu telnet客户端的启动

1. sudo apt-get install xinetd telnetd


2. 安装成功后，系统也会有相应提示，

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. sudo vi /etc/xinetd.conf并加入以下内容：
# Simple configuration file for xinetd
#  www.atcpu.com  
# 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. 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.atcpu.com  
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客户端远程登录即可进行非root用户访问。

7.使用root登录： mv /etc/securetty /etc/securetty.bak 这样root可以登录
了。
也可这样:

修改/etc/pam.d/login这个文件。只需将下面一行注释掉即可。
#auth required lib/security/pam_securetty.so