Ubuntu系统（六）-安装SSH服务端和客户端及Telnet

sudo apt-get install openssh-server openssh-client

SSH服务端关闭与启动

客户端链接

安装telnet

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并加入如下一行

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

3. sudo vi /etc/xinetd.conf并加入如下内容：

# 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

修改前以下：

修改成

4. sudo vi /etc/xinetd.d/telnet并加入如下内容：

# 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客户端远程登陆便可进行非root用户访问。

注意事项：安装telnet时注意

apt-get install xinetd telnetd 不要分开

不然提示：telnet has no installation candidate

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