Difference between revisions of "Telnet"

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[[Category:Daemons_and_system_services (English)]]
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[[Category:Daemons and system services]]
 
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[[de:Telnet]]
{{i18n_links_start}}
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[[es:Telnet]]
{{i18n_entry|English|Telnet}}
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[[zh-CN:Telnet]]
{{i18n_entry|简体中文|Telnet (简体中文)}}
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[[Wikipedia:Telnet|Telnet]] is the traditional protocol for making remote console connections over TCP. Telnet is '''not secure''' and is mainly used to connect to legacy equipment nowadays. For a secure alternative see [[SSH]].
{{i18n_links_end}}
 
=Introduction=
 
 
 
TELNET is the traditional protocol for making remote console connections over TCP. TELNET is not secure, and is mainly used to connect to legacy equipment now days.
 
  
 
Follow these instructions to configure an Arch Linux machine as a telnet server.
 
Follow these instructions to configure an Arch Linux machine as a telnet server.
  
=Installation=
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==Installation==
 
 
To only use telnet to connect to other machines, install netkit-telnet:
 
 
 
<pre>
 
# pacman -S netkit-telnet
 
</pre>
 
 
 
To also configure a telnet server, install xinetd as well:
 
 
 
<pre>
 
# pacman -S xinetd netkit-telnet
 
</pre>
 
 
 
*Important, "Telnetd is evil legacy code and is not trustworthy - do not run it unless you absolutely need it." a quote from the netkit-telnet readme.
 
 
 
A better option when needing a telnet server, is to install telnet-bsd from AUR instead of netkit-telnet (which also has support for IPv6).
 
 
 
=Configuration=
 
  
1. To allow telnet connections in xinetd:
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To use telnet only to connect to other machines, install inetutils (if not already installed):
<pre>
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# pacman -S inetutils
# vi /etc/xinetd.d/telnet
 
</pre>
 
  
Change 'disable' from 'yes' to 'no'
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To configure a telnet server, install xinetd as well:
 +
# pacman -S xinetd
  
2. To allow telnet connections to your machine, add the following to /etc/hosts.allow:
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==Configuration==
<pre>
 
in.telnetd: ALL
 
</pre>
 
  
3. Add xinetd to the "DAEMONS" section of your /etc/rc.conf file.
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1. To allow telnet connections in xinetd, edit {{ic|/etc/xinetd.d/telnet}} and change '{{Ic|1=disable = yes}}' to '{{Ic|1=disable = no}}'
  
<pre>
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2. Add {{Ic|xinetd}} to the {{Ic|DAEMONS}} array of your [[rc.conf]]:
DAEMONS=(syslog-ng network netfs crond ............ xinetd)
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DAEMONS=(... '''xinetd''')
</pre>
 
  
4. Reboot or restart xinetd:
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3. Reboot or restart xinetd:
<pre>
+
# /etc/rc.d/xinetd restart
# /etc/rc.d/xinetd restart
 
</pre>
 
  
 
===Testing the setup===
 
===Testing the setup===
  
 
Try opening a telnet connection to your server:
 
Try opening a telnet connection to your server:
<pre>
+
$ telnet localhost
$ telnet localhost
 
</pre>
 
  
Note that you can not login as root (to either netkit or bsd telnet).
+
Note that you can not login as root.

Revision as of 18:58, 29 November 2012

zh-CN:Telnet Telnet is the traditional protocol for making remote console connections over TCP. Telnet is not secure and is mainly used to connect to legacy equipment nowadays. For a secure alternative see SSH.

Follow these instructions to configure an Arch Linux machine as a telnet server.

Installation

To use telnet only to connect to other machines, install inetutils (if not already installed):

# pacman -S inetutils

To configure a telnet server, install xinetd as well:

# pacman -S xinetd

Configuration

1. To allow telnet connections in xinetd, edit /etc/xinetd.d/telnet and change 'disable = yes' to 'disable = no'

2. Add xinetd to the DAEMONS array of your rc.conf:

DAEMONS=(... xinetd)

3. Reboot or restart xinetd:

# /etc/rc.d/xinetd restart

Testing the setup

Try opening a telnet connection to your server:

$ telnet localhost

Note that you can not login as root.