[[email protected] wj]# rpm -qa | grep telnet

[[email protected] wj]# yum install -y telnet-server   //telnet

Installed:

  telnet-server.i686 1:0.17-48.el6                                                                                          

Complete!

[[email protected] wj]# yum install -y telnet      //telnet客戶端，可以連線其他電腦

Installed:

  telnet.i686 1:0.17-48.el6                                                                                                 

Complete!

[[email protected] wj]#gedit /etc/xinetd.d/telnet

 # default: on

# description: The telnet server serves telnet sessions; it uses \

#   unencrypted username/password pairs for authentication.

Service telnet

{

    flags      = REUSE

    socket_type   = stream        

    wait       = no

    user       = root

    server     = /usr/sbin/in.telnetd

    log_on_failure    += USERID

    disable       = no  //這個預設是yes，只有改成no才可以啟動telnet

}

[[email protected] wj]# gedit /etc/service 

telnet          23/tcp     //為了防止被攻擊，一般都不會使用23埠。注意這裡的23埠要使用tcp和udp兩種協議

telnet          23/udp 

[[email protected] wj]# gedit /etc/sysconfig/iptables

-A INPUT -m state --state NEW -m tcp -p tcp --dport 23 -j ACCEPT

-A INPUT -m state --state NEW -m udp -p udp --dport 23 -j ACCEPT

[[email protected] wj]# service iptables restart

iptables：將鏈設定為政策 ACCEPT：filter nat                [確定]

iptables：清除防火牆規則：                                 [確定]

iptables：正在解除安裝模組：                                   [確定]

iptables：應用防火牆規則：                                 [確定]

iptables：載入額外模組：nf_conntrack_ftp                   [確定]

[[email protected] wj]# service xinetd restart        //telnet依賴xinetd

停止xinetd：                                             [確定]

正在啟動xinetd：                                          [確定]

[[email protected] wj]# telnet 192.168.0.119

Trying 192.168.0.119...

Connected to 192.168.0.119.

Escape character is '^]'.

CentOS release 6.5 (Final)

Kernel 2.6.32-431.el6.i686 on an i686

login: david

Password: 

Last login: Thu Aug 16 08:24:19 from 192.168.0.119

already login