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172 lines
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<H4>By Jim Dennis, Ben Okopnik, Dan Wilder, Breen, Chris, and the Gang,
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the Editors of Linux Gazette...
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and You!
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<br>Send questions (or interesting answers) to
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
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height="50" width="60" alt="(?) " border="0"
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>DNS and telnet</H3>
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<p><strong>From crabe
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</strong></p>
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<p align="right"><strong>Answered By Mike Orr
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<br></strong></p>
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<!-- sig -->
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<P><STRONG>
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Hi,
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How do you get telnet working on your own machine as referred to in the
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DNS HOWTO, i.e telnetting at 127.0.0.1 ? I got telnet working to reach
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my ISP but never got around telnetting 127.0.0.1. So I gave up DNS.
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I have looked around all the HOWTOs available, and perhaps it's too
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simple for mentionning.
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I am running LinuxPPC2000.
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Thanks for any answer.
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</STRONG></P>
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<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
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HEIGHT="28" WIDTH="50" BORDER="0"
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> [Mike]
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Are you trying to do a standard telnet ("telnet 127.0.0.1") or telnet
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to another port ("telnet 127.0.0.1 53" would be a DNS query)? Here are
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a few possibilities:
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</BLOCKQUOTE>
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<BLOCKQUOTE><ol>
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<li> Nobody is listening on the telnet port. If so, you'll get an immediate
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"connection refused" error. Telnetd is normally started from inetd.
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Uncomment the telnet line in <TT>/etc/inetd.conf</TT> and "killall -HUP inetd".
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<li> Your loopback devide is not configured. What happens when you run
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"ping 127.0.0.1"? If you get no response, do "ifconfig". There should
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be a stanza for device "lo". If not, run "ifconfig lo 127.0.0.1" and/or
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"ifconfig 127.0.0.1 up". (If you're still running kernel 2.0.x, follow that
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with "route add -net 127.0.0.0"). Then look at your network startup scripts to
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see why it isn't being activated by default.
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<li> Inetd runs telnet through a tcpd wrapper for security, and you're failing
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the tcpd check. This would cause the connection to do nothing (at least
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nothing visible) and then disconnect after a couple seconds. See
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"man tcpd" and "man 5 hosts_access".
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<li> You are telnetting to port 53 and your nameserver is not running.
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If so, you'd get a "connection refused" error. If you installed named
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(bind), find out why it isn't running.
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</ol></BLOCKQUOTE>
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<BLOCKQUOTE>
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The TAG security hawks will send a follow-up if I don't also mention
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that telnet is a security risk bla bla bla because it doesn't encrypt
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your password or your data. Think twice before running telnetd, and
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think a third time before allowing tcpd to allow telnet connections from
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outside your local network.
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</BLOCKQUOTE>
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<H5 align="center">This page edited and maintained by the Editors
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of <I>Linux Gazette</I>
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<a href="http://www.linuxgazette.com/copying.html"
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>Copyright ©</a> 2001
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<BR>Published in issue 65 of <I>Linux Gazette</I> April 2001</H5>
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