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Old 01-12-2006, 09:03 AM   #1
Registered: Mar 2004
Location: Boston
Distribution: Fedora 2
Posts: 39

Rep: Reputation: 15
Telnet/Web server OUTSIDE my router problems

This might be a question more suited for the networking forum, but I am a noob so its quite possible I am missing something simply

I have a box running fedora 2... I have it set as a telnet/webserver.

INSIDE my little network, I can telnet to it and see the webpage from both the internal IP and the IP shown on my linksys router that I would of thought was the external IP..

However, in testing with a friend, he cannot see me to telnet or see the webpage. I have ports 21-23 and 80 open. I have also attempted getting the ip by taking the cable modem and connecting directly to another machine to get the ip.

I guess my question is, am I missing something on the linux box itself that would allow me to connect to it from outside the router? Or is this most likely just a router issue?
Old 01-12-2006, 09:18 AM   #2
Registered: Apr 2002
Posts: 498

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Could be a router issue. Connect everything to your cable modem, get your public IP ( among others) and have a friend connect to that. If that doesn't work, check that the correct ports forward to the correct LAN IP addresses. Make sure your server's/router's firewall isn't blocking incoming requests on those ports.

If all else fails, your ISP could be the culperate. Many large ISPs have taken to blocking all incoming traffic on common ports, e.g. 25, 80, etc., in an effort to stop certain types of malware.
Old 01-12-2006, 09:18 AM   #3
Registered: Jan 2005
Location: Ann Arbor MI
Distribution: Mandriva 2006
Posts: 99

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Internet provider

It is possible that your internet provider is blocking those ports to prevent you from serving, I have heard comcast does this although I am certainly no expert in this kind of stuff. I believe you can serv it though some wierd port and just type that port in with the address to get to it.
Old 01-12-2006, 11:14 AM   #4
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Registered: Dec 2005
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Another thing to note is that you really shouldn't use telnet outside your home network. It's not very secure. You should use ssh.

And just in case you don't understand what rmakers is saying, you can configure your web server (presumably apache) to work off of port XYZ instead of port 80 and then when you want to access it, type
Old 01-12-2006, 03:21 PM   #5
Registered: Mar 2004
Location: Boston
Distribution: Fedora 2
Posts: 39

Original Poster
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turns out

comcast does not block the ports, so i attempted to check the ip with that site from the linux box and i had no connection to the internet, just the local network

it was set to a static ip so i assume my gateway or dns was set wrong..

i have it set to dhcp for the moment and it seems to be working


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