Telnet 서버 설치 및 Telnet /FTP 기동

[Luke]

Telnet server installation

Debain/Ubuntu Linux user type the following command:
# apt-get install telnetd
OR
$ sudo apt-get install telnetdFedora Linux user the following command:
# yum install telnet-server telnetRed Hat enterprise Linux user type the following command:
up2date telnet-server telnetFreeBSD user type the following command:
No need to install new (telnet server) package, it is installed by default (/usr/libexec/telnetd)

 

Configure telnet server (turn on telnet server)

Again each distribution has its own method to turn on or off telnet service; same applies to telnet UNIX/Linux server.

If you are using Red Hat / Fedora Linux
The configuration file for telnet is /etc/xinetd.d/telnet. To enable telnet server you need to open this file and make sure disable = no read as disable = yes.
Alternately,
# chkconfig telnet onTo start telnet server type command:
# /etc/init.d/xinetd restartIf you are using Debian Linux
The configuration file for telnet is /etc/inetd.conf. By default it is enabled when you install telnet server. To start telnet server type command:
# /etc/init.d/inetd restartIf you are using FreeBSD
The configuration file for telnet is /etc/inetd.conf. Open file using vi text editor and uncomment line:
# vi /etc/inetd.conf
Make sure commented line:
#telnet stream tcp nowait root /usr/libexec/telnetd telnetdRead as follows:
telnet stream tcp nowait root /usr/libexec/telnetd telnetdSave and close the file. Start telnet service:

Enable inetd service so that telnet get loaded:
# vi /etc/rc.confAppend/add following line to configuration file:
inetd_enable="YES"Save and close the file, Rsstart telnet via inetd service:
# /etc/rc.d/inetd restart

 

Telnet to server (How do I use telnet client?)

You should now be able to telnet to the server from Windows or Linux desktop system. Type the following command to connect to Telnet server:telnet server-ip-address
telnet 192.168.1.5

[Telnet 서버 기동하기]

/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 

} 

/etc/xinetd.d/gssftp

service ftp

{

flags = REUSE

socket_type = stream

wait = no

user = root

server = /usr/kerberos/sbin/ftpd

server_args = -l

log_on_failure +=USERID

disable=no

}

# /etc/init.d/xinetd restart 

or

#service xinetd restart

로 xinetd 데몬을 재시작해 줍니다.

그리고 텔넷은 보안상의 이유로 root의 접근을 거부합니다.

방법이 없는 것은 아니지만(/etc/securetty를 지워주면 root로 로그인 할 수 있습니다.)

root로 작업을 해야 한다면 일반유저로 접근하여 su 명령을 통해서 root로 작업하시거나 SSH(Secure Shell)을 이용할 것을 권장합니다.