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Full Discussion: telnet issues
Top Forums UNIX for Dummies Questions & Answers telnet issues Post 29089 by saabir on Monday 30th of September 2002 05:50:23 AM
Old 09-30-2002
While cbkihong suggestion relating to firewalls is definately a component in a long-term solution to secure your servers - in this instance it may be easier to setup the inetd.sec file to specifically limit access to the telnet daemon.

The syntax is:

<service name> <allow|deny> <host/net addresses, host/net names>

The man page will help further.
 

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LEARN ABOUT DEBIAN

in.identtestd

IN.IDENTTESTD(8)						 Library functions						  IN.IDENTTESTD(8)

NAME

       in.identtestd - a small daemon that can be used to test Ident servers

SYNOPSIS

       in.identtestd

DESCRIPTION

       in.identtestd  is  a  small daemon (to be started from inetd) that does an ident lookup on you if you telnet into it. Can be used to verify
       that your Ident server is working correctly.

       The source code can be found in the debian libident source package, as ident-tester.c.

EXAMPLE

       A typical entry in /etc/inetd.conf would be:

       9999 stream tcp nowait root /usr/sbin/in.identtestd in.identtestd

       With the above entry in place and active, execute "telnet hostname 9999" from either this system, or another system. It should  show  some-
       thing like:

	   Trying hostname...
	   Connected to hostname.
	   Escape character is '^]'.
	   Welcome to the IDENT server tester, version 1.9

	   (Linked with libident 0.22 Debian)

	   Connecting to Ident server at 192.168.1.1...
	   Querying for lport 1109, fport 9999....
	   Reading response data...
	   Userid response is:
	      Lport........ 1109
	      Fport........ 9999
	      Opsys........ UNIX
	      Charset...... <not specified>
	      Identifier... paul
	   Connection closed by foreign host.

AUTHOR

       Peter Eriksson <pen@lysator.liu.se>
       Manpage written for debian by Paul Slootman <paul@debian.org>.

SEE ALSO

       ident(3), identd(8), tcpd(8)

3rd Berkeley Distribution													  IN.IDENTTESTD(8)
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