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Old 03-21-2008, 07:48 PM   #1
Registered: Aug 2004
Location: Ohio
Distribution: Debian, Slackware
Posts: 58

Rep: Reputation: 15
Can't access my server from within the network

Here's my setup:
I've got a cable modem that's connected to the internet and to my router. Connected to my router I have a laptop (wifi) and two desktops - my server and my desktop. My router is set to forward all ports to my server.

When I ask other people to try and access my public IP or my domain name ( from outside of my network, they are able to get there with no problem. When I try to access the server from within the network with its my external IP or domain name, the connection times out. I *can* access my server if I use the local IP (192.168...).

Obviously, I would like to be able to access my server from inside the network with my external IP or domain name. I know I can just edit /etc/hosts and add a line for my server, but I don't want to have to do that for each computer that connects to my network.

My router is a Netgear WGR614 v6 and my modem is a Motorola Surfboard.

Any help, please?
Old 03-22-2008, 05:38 AM   #2
Senior Member
Registered: Mar 2004
Location: Wales, UK
Distribution: Debian, Ubuntu
Posts: 1,075

Rep: Reputation: 45
Your internal systems are probably using a DNS service that doesn't know about the external IP address/name of your server. If you register a domain then it normally takes several days to fully propagate across all of the DNS servers, and if you are using a dynamic DNS provider then I guess that is a potential point of failure, too.

You can test the DNS on any client with the nslookup utility to confirm that this is a DNS issue (even Windows ships with nslookup).

I generally don't recommend supplementing DNS with hardcoded local entries in the hosts file, because it really just hides the problem, rather than fixing it.
Old 03-22-2008, 11:26 AM   #3
Registered: Aug 2004
Location: Ohio
Distribution: Debian, Slackware
Posts: 58

Original Poster
Rep: Reputation: 15
Problem solved.

Turns out my router didn't support NAT Loopback - I went to bestbuy and bought a new one which did. Everything works as it should, now.

Also, I use to manage my domain name. Their name servers are set up to always point at my IP address (through a wget script + cronjob). It should only take a few days if I'm actually changing my name server, not the name server's records.



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