LinuxQuestions.org
Register a domain and help support LQ
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Newbie
User Name
Password
Linux - Newbie This Linux forum is for members that are new to Linux.
Just starting out and have a question? If it is not in the man pages or the how-to's this is the place!

Notices

Reply
 
Search this Thread
Old 07-20-2011, 11:56 PM   #1
shipon_97
Member
 
Registered: Oct 2005
Location: Bangladesh
Posts: 447

Rep: Reputation: 30
Disable telnet command from Linux client end !


Dear Friends ,

From Linux client end I can easily telnet to a remote Linux server easily , Like :


[root@apps1 ~]# telnet 192.168.1.14
Trying 192.168.1.14...
Connected to 192.168.1.14 (192.168.1.14).
Escape character is '^]'.

catalog.aibl.com (Linux release 2.6.18-8.el5 #1 SMP Tue Jun 5 23:25:19 EDT 2007) (1)

login:


But I want to disable the "telnet" command from the client end , so that I cannot telnet to a remote linux server from the Linux client end .

Waiting for kind reply ... ..
 
Old 07-21-2011, 12:26 AM   #2
chrism01
Guru
 
Registered: Aug 2004
Location: Sydney
Distribution: Centos 6.5, Centos 5.10
Posts: 16,287

Rep: Reputation: 2034Reputation: 2034Reputation: 2034Reputation: 2034Reputation: 2034Reputation: 2034Reputation: 2034Reputation: 2034Reputation: 2034Reputation: 2034Reputation: 2034
Just remove the telnet client SW
 
Old 07-21-2011, 01:02 AM   #3
shipon_97
Member
 
Registered: Oct 2005
Location: Bangladesh
Posts: 447

Original Poster
Rep: Reputation: 30
Thx for kind reply ..

Would u plz tell me how to remove the telnet client software ...., I remove the telnet package from the client end , but still it works ..

See the below output plz :

>[root@apps2 ~]# rpm -q telnet
telnet-0.17-31.EL4.5
[root@apps2 ~]# rpm -e --nodeps telnet
[root@apps2 ~]# rpm -q telnet
package telnet is not installed
[root@apps2 ~]# telnet 192.168.1.14
Trying 192.168.1.14...
Connected to 192.168.1.14 (192.168.1.14).
Escape character is '^]'.

test.com (Linux release 2.6.18-8.el5 #1 SMP Tue Jun 5 23:25:19 EDT 2007) (1)

login:
 
Old 07-21-2011, 04:23 AM   #4
Oliv'
Senior Member
 
Registered: Jan 2004
Location: Montpellier (France)
Distribution: Gentoo
Posts: 1,014

Rep: Reputation: 36
Hello,

Well you could try a command like:
Code:
rpm -q --whatprovides telnet
to check if another package provides telnet binary.
Also be aware that some tools like netcat easily allows you to connect to a telnet server.

Kind regards,

Oliv'
 
Old 07-21-2011, 10:04 AM   #5
Wim Sturkenboom
Senior Member
 
Registered: Jan 2005
Location: Roodepoort, South Africa
Distribution: Slackware 10.1/10.2/12, Ubuntu 12.04, Crunchbang Statler
Posts: 3,786

Rep: Reputation: 282Reputation: 282Reputation: 282
Why do you want to do that
 
Old 07-21-2011, 10:23 AM   #6
TobiSGD
Moderator
 
Registered: Dec 2009
Location: Hanover, Germany
Distribution: Main: Gentoo Others: What fits the task
Posts: 15,592
Blog Entries: 2

Rep: Reputation: 4047Reputation: 4047Reputation: 4047Reputation: 4047Reputation: 4047Reputation: 4047Reputation: 4047Reputation: 4047Reputation: 4047Reputation: 4047Reputation: 4047
Wouldn't it be the better approach to remove telnet from the server, since it is deprecated and insecure?
 
Old 07-21-2011, 07:26 PM   #7
chrism01
Guru
 
Registered: Aug 2004
Location: Sydney
Distribution: Centos 6.5, Centos 5.10
Posts: 16,287

Rep: Reputation: 2034Reputation: 2034Reputation: 2034Reputation: 2034Reputation: 2034Reputation: 2034Reputation: 2034Reputation: 2034Reputation: 2034Reputation: 2034Reputation: 2034
That would be my preference; I was giving the OP the benefit of the doubt there... should have asked anyway .

A related article of why (& how) not to use rsh/telnet etc http://www.informit.com/articles/art...p=169465&rll=1

Last edited by chrism01; 07-21-2011 at 07:27 PM.
 
Old 07-23-2011, 12:34 AM   #8
Wim Sturkenboom
Senior Member
 
Registered: Jan 2005
Location: Roodepoort, South Africa
Distribution: Slackware 10.1/10.2/12, Ubuntu 12.04, Crunchbang Statler
Posts: 3,786

Rep: Reputation: 282Reputation: 282Reputation: 282
Quote:
Originally Posted by TobiSGD View Post
Wouldn't it be the better approach to remove telnet from the server, since it is deprecated and insecure?
It's why I asked. Still waiting for the reply
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Smart Linux telnet client edusilva Linux - Software 7 10-31-2012 09:12 AM
Linux Telnet Client? jonwatson Linux - Software 23 03-16-2009 04:31 AM
Can't end telnet servcie in xinetd when close remote telnet cliend forcely zeroneworld Linux - Newbie 2 12-09-2007 08:47 PM
Can't end telnet servcie in xinetd when close remote telnet cliend forcefully. zeroneworld Linux - General 1 12-06-2007 07:17 AM


All times are GMT -5. The time now is 04:17 AM.

Main Menu
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration