ubuntutelnet命令(ubuntu test命令)
如何启动ubuntu下的telnet服务
以一般用户登录系统;
执行命令 sudo apt-get install xinetd;
系统提示输入用户密码,输入密码后安装xinet软件包;
执行命令 sudo apt-get install telnetd;
系统提示输入用户密码,输入密码后安装telnet软件包;
新建一个文件/etc/xinetd.d/telnet,内容如下,并保存;
编辑文件/etc/xinetd.d/telnet,输入以下内容:
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# 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
}
编辑文件/etc/xinetd.conf,并加入如下内容:
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instances = 60
log_type = SYSLOG authpriv
log_on_success = HOST PID
log_on_failure = HOST
cps = 25 30
执行命令 sudo /etc/init.d/xinetd restart
在ubuntu11.04的PC机上验证上述方法可行,部分内容有修改。
解决Ubuntu中telnet 127.0.0.1时Unable to connect to remote host: Connection refused的问题
执行命令
$ telnet 127.0.0.1
报错
能够执行telnet命令并不代表系统中安装了telnet服务。
由于是远程连接本地,所以本地需要有telnet服务才能进行连接。
输入命令
$ netstat -tnl
查看端口状态
可以看到没有进程在监听本地的23端口,说明本地的telnet服务没有启动。
$ sudo apt-get install xinetd telnetd
$ sudo vi /etc/inetd.conf
并加入以下一行
$ sudo vi /etc/xinetd.conf
并修改为以下内容
$ sudo vi /etc/xinetd.d/telnet
并输入以下内容
$ netstat -tnl
可以看到正在监听23端口
$ telnet 127.0.0.1
ubuntu打开telnet服务具体步骤
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
#
# 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
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
8. 详细配制/etc/xinetd.d/telnet
service telnet
{
disable =no
bind =192.168.1.2
only_from=192.168.1.0/24
#上面这两行说明仅提供内部网段!
Instance =UNLIMITED
Nice =0
Flags =REUSE
socket_type=stream
wait =no
user =root
#server =/usr/sbin/telnetd
server =/usr/sbin/in.telnetd
server_args =-a none
log_on_failure +=USERID
}
service telnet
{
disable =no
bind =140.116.142.196
only_from=140.116.0.0/16
no_access=140.116.32.{10,26}
#上面三行设置外部较为严格的限制
instance =10
umask =022
nice =10
flags =REUSE
socket_type=stream
wait =no
user =root
#server =/usr/sbin/telnetd
server =/usr/sbin/in.telnetd
log_on_failure +=USERID
}
9.加设防火墙iptables:
如果想要针对192.168.0.0/24这个网段及61.xxx.xxx.xxx这个IP进行telnet开放,
可以增加下面几行规则:
/sbin/iptables -A INPUT -p tcp -i eth0 -s 192.168.0.0/24 --dport 23 -j
ACCEPT
/sbin/iptables -A INPUT -p tcp -i eth0 -s 61.xxx.xxx.xxx --dport 23 -j
ACCEPT
/sbin/iptables -A INPUT -p tcp -i eth0 --dport 23 -j DROP
10.加设防火墙/etc/hosts.allow(deny)机制:
上面开放了192.168.0.0/24这个网段,但是如果您只想让其中的
192.168.0.1~192.168.0.5进入,可以设置如下 :
vi /etc/hosts.allow
in.telnetd:192.168.0.1,192.168.0.2,192.168.0.3,192.168.0.4,192.168.0.5:allow
*原文地址*
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*UBUNTU开启TELNET服务*
1. sudo apt-get install xinetd telnetd
2. 安装成功后,系统也会有相应提示(好象710才有,610就没看到),
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
#
# 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
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;