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  #1  
Old 26th December 2010, 07:55 AM
sanhdjeulove Offline
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help needed with telnet

install telnet in fedora 14 then how ? ? ? ? ? ?
How to configure telnet???????????
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  #2  
Old 26th December 2010, 08:21 AM
smr54 Offline
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Re: help

A few comments...

The extra question marks won't help. Also, a subject line such as help will often be ignored by the most knowledgeable people, as they're often the busiest, and they will think--I realize this sounds a bit mean, but it's how it is, if you can't take the time to put in a helpful subject line, why should they take the time. See

http://catb.org/esr/faqs/smart-questions.html

It's really worth a read.

Do you know how to search for a package in Fedora? It's done with

yum search <package_name_or_description>

In this case

yum search telnet

will give a long list, so you might want to do

yum search telnet|more

which will give you a page at a time, and show you that the first two listings are telnet and telnet-server. (Probably, anyway, I'm on CentOS as I type.)

You don't say if you need the client or server. If you just want to telnet to something else use

yum install telnet

Note that these commands, search and install, can be used for anything.

If you want a telnet server, firstly, I would recommend that you don't do it--use ssh instead. The reason is that telnet is an old program, and passwords are visible in clear text. So, it's very easy to grab the passwords from a telnet session.

However, if for some reason, you have to have one, then you would do yum install telnet-server. After that, I don't remember how to set it up, as I haven't done it in 6 years or more. If I remember correctly, you might have to enable it in /etc/xinetd.d somewhere.
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  #3  
Old 26th December 2010, 09:43 AM
emptyict Offline
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Re: help

This's really old problem.May be this question for study about FC.To help answer,I've installed telnet-0.17-47.fc14.x86_64 package on FC 14,but in Firewall Configuration,I haven't saw the port 23,why?I red some documents,after install telnet,there'll be have file "telnet" in /etc/xinetd.d,but there isn't.
And I have a question,I want to access to linux server by telnet protocol,from windows-client and by sercureCRT soft.Who can guide for me?

Last edited by emptyict; 26th December 2010 at 10:17 AM.
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  #4  
Old 26th December 2010, 01:15 PM
markkuk Offline
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linuxfedorafirefox
Re: help

Quote:
Originally Posted by emptyict View Post
This's really old problem.May be this question for study about FC.To help answer,I've installed telnet-0.17-47.fc14.x86_64 package on FC 14,but in Firewall Configuration,I haven't saw the port 23,why?I red some documents,after install telnet,there'll be have file "telnet" in /etc/xinetd.d,but there isn't.
You have installed only the telnet client. The client doesn't need firewall or xinetd configuration changes.
Quote:
Originally Posted by emptyict View Post
And I have a question,I want to access to linux server by telnet protocol,from windows-client and by sercureCRT soft.Who can guide for me?
Install the telnet-server package.
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  #5  
Old 26th December 2010, 11:59 AM
Dan Offline
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Re: help needed with telnet

(Thread title changed to something useful.)
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  #6  
Old 26th December 2010, 02:08 PM
jpollard Offline
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Re: help needed with telnet

The only redeeming grace for telnet is the modifications made by
MIT to include Kerberos.

But you also need a Kerberos environment to make telnet even minimally
safe (there are a few bugs that cannot be fixed due to compatibility
requirements).
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  #7  
Old 29th December 2010, 07:36 AM
emptyict Offline
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Re: help needed with telnet

I use software SecureCRT to access from client-windows to server linux.Telnet service and ssh service are installed.ssh is successful


but not with telnet:



Anyone show me why?
Tks very much

---------- Post added at 02:36 PM ---------- Previous post was at 02:49 AM ----------

nobody help me?
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  #8  
Old 29th December 2010, 12:58 PM
jpollard Offline
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Re: help needed with telnet

There are very few users of telnetd left. The client telnet is usefull for
testing TCP connections (as in checking Apache manually, though curl
does it too).

I haven't used it in over 3 years.
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  #9  
Old 29th December 2010, 02:55 PM
emptyict Offline
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Re: help needed with telnet

Quote:
Originally Posted by jpollard View Post
There are very few users of telnetd left. The client telnet is usefull for
testing TCP connections (as in checking Apache manually, though curl
does it too).

I haven't used it in over 3 years.
I know that.But my teacher want we do some thing,with telnet protocol.I'l try myself.
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  #10  
Old 29th December 2010, 09:34 PM
jpollard Offline
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Re: help needed with telnet

So does your system log any errors when you try to use it?
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  #11  
Old 29th December 2010, 11:31 PM
kurtdriver Offline
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Re: help needed with telnet

Emptyvict, you really should use ssh instead of telnet. A good ssh client for Microsoft used to be Putty.exe. it might still be, my knowledge of Microsoft is a little bit old. Have you asked your instructor about using modern protocols? Even if you are working from an old book, he/she may allow ssh in place of telnet.
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  #12  
Old 30th December 2010, 02:54 AM
forkbomb Offline
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Re: help needed with telnet

Quote:
Originally Posted by kurtdriver View Post
Emptyvict, you really should use ssh instead of telnet. A good ssh client for Microsoft used to be Putty.exe. it might still be, my knowledge of Microsoft is a little bit old. Have you asked your instructor about using modern protocols? Even if you are working from an old book, he/she may allow ssh in place of telnet.
Putty's still maintained and works fine.

[soapbox]I hate to keep hammering on this point but it bothers me when desperate students come in asking for help with EOL distributions or legacy software (I don't fault the student). Maybe it's because I've been there as a student. It's frustrating to have a prof ask you to burn time on learning how to use and support something that shouldn't be used anymore.

Going head-to-head with professors on matters of curriculum is not always rarely worth the time, but I'd seriously consider having a chat with a professor who was still "teaching" for telnetd in 2010. The time lags involved in writing/updating/proofing/publishing/distributing textbooks almost always means that textbooks are somewhat out-of-date by the time they get into the hands of students, but Telnet's been deprecated for years. I can't see a reason to teach it unless it's a course dedicated specifically to supporting legacy software.

Shoot... maybe the professor would even appreciate the extra work if a student took initiative to write up a little "case against Telnet."[/soapbox]
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Last edited by forkbomb; 30th December 2010 at 02:59 AM.
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  #13  
Old 30th December 2010, 12:41 PM
jpollard Offline
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Re: help needed with telnet

There are several "cases against telnet"...

1. security. The full telent protocol doesn't allow for encryption - the problem
is the out-of-band messages it can use. These cause the input
stream to re-order (at a message level - which is a single byte) and kill all
encryption sequencing. The kerberos implementation (when I saw it)
disables out-of-band messaging, and has to implement encryption and
authentication in a very awkward manner.

2) The client falls back to a simple TCP connection when the telnet protocol
fails - this is why the client is usefull for testing TCP connections, it isn't using
the telnet protocol.

3) The telnet protocol was the first handshaking done to try to implement
cross-system terminal independence. The protocol tries to translate
terminal line settings from one system to another... and usually falls back
to the BSD structure instead.

4)Because of the old handshaking (and out-of-band messaging) telnet
has the most arcane setup ever. It is very difficult to follow (there are
multiple state variables involved) and nearly impossible to modify. Even
the Kerberos implementation isn't perfect - there is a bug in the encryption
stream that causes a stream perturbation cycle, this allows
an encrypted stream to be recovered IF you have the keys, but not
the entire stream - packet decryption fails until the cycle repeats. The
stream cypher design is intended to prevent this... but the bug prevents
it. And the bug can't be fixed as the protocol doesn't have a version
identification handshake so that a fallback operation can be implemented.

5) The code for the handshake is truly horrible. It is the worst I have ever
seen for an internet standard. Of course, it is also about the oldest
application protocol there is.

6) it is discouraged from use by every organization that knows anything
about security.

Last edited by jpollard; 30th December 2010 at 12:44 PM. Reason: I really wish there were a "preview" option...
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  #14  
Old 30th December 2010, 05:32 PM
kurtdriver Offline
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Re: help needed with telnet

Quote:
Originally Posted by jpollard View Post
Last edited by jpollard; Today at 04:44 AM. Reason: I really wish there were a "preview" option...
Clicking on "Go Advanced provides that feature."
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