<br><br><div><span class="gmail_quote">On 22/05/07, <b class="gmail_sendername">Tim</b> <<a href="mailto:ignored_mailbox@yahoo.com.au">ignored_mailbox@yahoo.com.au</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>Lux Zhang:<br>>>> I need telnet to access adsl server.<br><br>Tim:<br>>> Really bad idea. Telnet is a really insecure protocol. If you can<br>>> use ssh, use it, instead.<br><br>Lux Zhang:<br>> I have no choice, the modem can only handle telnet
<br><br>Unless it's the modem, itself, that you're telnetting to, then that's<br>wrong.<br><br>A telnet server is usually something running on a computer (and that<br>seems to be what you've described), all a modem/router has to do is
<br>forward the right port number through to the computer. The port number<br>is whatever you choose, you don't have to use defaults, and the modem<br>doesn't care what goes through that port (telnet, SSH, HTTP, or anything
<br>else).<br><br>If it is the modem that you need to telnet to, a far safer solution<br>might be to disalllow the modem to receive WWW telnet connections,<br>forward a SSH connection through to a PC inside your LAN, remote connect
<br>to it in a secure manner, then telnet from that internal PC to your<br>modem.</blockquote><div><br>Thanks Tim,<br><br>The road is <br><br>remote PC(External) -> internet ->modem->router->telnet/ftp/www server PC
<br> (internal)<br><br>I set address forward for ftp/telnet/www in modem BUT ONLY ftp/www in router, did not set (overlooked) the address for telnet. After set the addresses in both modem and router, the PC server can be accessed from the remote (external) computer.
<br><br><br><br><br></div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">> But with remote telnet I got this<br>><br>> [zhang@tring
~]$ telnet <a href="http://79.15.54.181">79.15.54.181</a> 7777<br>> Trying 79.15.54.181...<br>> telnet: connect to address <a href="http://79.15.54.181">79.15.54.181</a>: Connection timed out<br>><br>> In fact the server did show any response
<br><br>And does that work if you try telnetting to port 7777 on a machine<br>inside your LAN rather than one outside it? I saw your prior message<br>saying it worked inside your LAN, but 7777 is an unusual port to play<br>
with. Was it the same port number that you tested before?</blockquote><div><br>I set this on the internal sever PC (opened port tcp/7777 in server PC and modem and router), BUT it is not working when access it from remote external PC to the internel server, I roll back to the default port
<br></div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">The default, for Fedora, is to run a firewall, so it could be blocked on<br>the machine running your server, itself.
<br><br>--<br>(This box runs FC6, my others run FC4 & FC5, in case that's<br> important to the thread.)<br><br>Don't send private replies to my address, the mailbox is ignored.<br>I read messages from the public lists.
<br><br><br>--<br>fedora-list mailing list<br><a href="mailto:fedora-list@redhat.com">fedora-list@redhat.com</a><br>To unsubscribe: <a href="https://www.redhat.com/mailman/listinfo/fedora-list">https://www.redhat.com/mailman/listinfo/fedora-list
</a><br></blockquote></div><br>