 www.centos.org Forum Index CentOS 6 - Networking Support  Can' see any ports on external IP address
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Can' see any ports on external IP address | #1 |
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Newbie
 
Joined: 2012/6/2
From
Posts: 3
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I am trying to config my machine so people on the outside world can access ports 80 and 25565(minecraft).
I have spent the better part of the afternoon googling and searching the forums, but so far no go. Topology ISP --> ARRIS TG852 (Cable Modem/Router combo) -+- wired connection --> to CentOS 6.2 box I have port forwarding set up on the router. Things I can do - access the apache web server and minecraft from machines on the internal subnet 192.168.0.2. - ping the public IP www.xxx.yyy.zzz Things I can't do - access the apache web server and minecraft from machines on www.xxx.yyy.zzz. Other points of note. godadday diagnostics thinks all is well canyouseeme.org thinks ports 80 and 25565 are open and available. SELinux is in permissive mode The firewall has the proper ports open, but I have even tried turning iptables off with no change in behavior. I have put my machine in the DMZ on the router with both iptables off and SELinux in permissive and still cannot access the ports I have talked to both godaddy and ISP tech support and they believe all is fine. I am out of ideas at this point. Any ideas greatly appreciated. |
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Posted on: 2012/6/2 22:59
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TexasJJJJJ
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Re: Can' see any ports on external IP address | #2 |
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Professional Board Member
Joined: 2006/12/30
From Colorado, USA
Posts: 472
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You've provided no real networking info, yet you're asking a question about how to setup your network.
As a guess, I'd say you're not forwarding the correct ports from the modem's PUBLIC IP to your CentOS's PRIVATE IP. |
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Posted on: 2012/6/2 23:13
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Re: Can' see any ports on external IP address | #3 |
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Newbie
Joined: 2012/6/2
From
Posts: 3
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Here's more info. Let me know what else would be useful
ifconfig iptables SELinux portforwarding |
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Posted on: 2012/6/2 23:32
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Re: Can' see any ports on external IP address | #4 |
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Moderator
Joined: 2009/9/24
From Brighton, UK
Posts: 6560
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Are you trying to access your own internal machines on their own external IP address? For example, on 192.168.0.3, going out through the same connection to the outside, you then try to access your own external IP address and get redirected to 192.168.0.2? If so then you probably cannot do that - it's what's called a hairpin connection and very few routers support such a thing. You'd need to test your external connection from a machine that didn't belong inside the same LAN and came from a different external source.
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_________________
Linux/VoIP Systems Administrator |
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Posted on: 2012/6/2 23:43
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Re: Can' see any ports on external IP address | #5 |
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Professional Board Member
Joined: 2006/12/30
From Colorado, USA
Posts: 472
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Quote:
That's the first time I heard it called "a hairpin connection" - I've always heard it called "NAT Reflection". Ironically it's the open source firewalls (like PFSense) that support it. Cisco recommends using a split-DNS solution. |
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Posted on: 2012/6/3 0:02
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Re: Can' see any ports on external IP address | #6 |
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Newbie
Joined: 2012/6/2
From
Posts: 3
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Thanks!
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Posted on: 2012/6/3 1:41
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