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

Posted on 2010-01-07
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

    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

    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.
    LVL 1

    Author Closing Comment

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

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    Better Security Awareness With Threat Intelligence

    See how one of the leading financial services organizations uses Recorded Future as part of a holistic threat intelligence program to promote security awareness and proactively and efficiently identify threats.

    AWS has developed and created its highly available global infrastructure allowing users to deploy and manage their estates all across the world through the use of the following geographical components   RegionsAvailability ZonesEdge Locations  Wh…
    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.
    After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
    This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor ( If you're looking for how to monitor bandwidth using netflow or packet s…

    779 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

    Need Help in Real-Time?

    Connect with top rated Experts

    18 Experts available now in Live!

    Get 1:1 Help Now