Can't connect to web server on LAN through face IP

Posted on 2010-01-07
Medium Priority
Last Modified: 2012-05-08
My network looks similar to the following:
computer: -> <- wireless router -> <- Quest DSL Modem Router (FACE IP) -> internet

I have port forwarding setup on the wireless router and the DSL Modem.
Through the Internet I can connect to the web server I have running on
I can also connect to the webserver via localhost (obviously).

What I can't do is connect to the web server using the FACE IP while on the local LAN.

What did I miss?
Question by:wgilster
LVL 11

Accepted Solution

ICaldwell earned 1000 total points
ID: 26207200
This is a flaw in some routers, if you wanted to type in your internet facing IP, you would need to be outside the network... In theory your trying to do this

Your IP -> Router -> Routers external IP -> Internal IP

but that doesn't work, most routers don't route data like that.  When you type in the routers IP, your internet facing IP, your router attempts to send the data to the internet, but it is not suppose to go to the internet, thus the problem... More advanced routers like CISCO ones can route the data correctly but dumb routers like the ones for home and some advanced routers cannot do this correctly...

Your router is working correctly, its just not what they were designed to do...
LVL 29

Assisted Solution

pwindell earned 1000 total points
ID: 26212869
It is a limitation of NAT,...not really a flaw in the NAT boxes themselves.  Some firewall developers have written programming "above" the NAT process to overcome it.  But even some expensive ones do not because the whole "Making a U-Turn" thing is just not something that is supposed to be done in the first place.

Author Closing Comment

ID: 31674416
Just looking for this to be ruled out by more than 1 person.  Thanks.

Featured Post

The IT Degree for Career Advancement

Earn your B.S. in Network Operations and Security and become a network and IT security expert. This WGU degree program curriculum was designed with tech-savvy, self-motivated students in mind – allowing you to use your technical expertise, to address real-world business problems.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Quality of Service (QoS) options are nearly endless when it comes to networks today. This article is merely one example of how it can be handled in a hub-n-spoke design using a 3-tier configuration.
David Varnum recently wrote up his impressions of PRTG, based on a presentation by my colleague Christian at Tech Field Day at VMworld in Barcelona. Thanks David, for your detailed and honest evaluation!
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're interested in additional methods for monitoring bandwidt…
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…
Suggested Courses

850 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question