Will this work?

Posted on 2006-04-11
Last Modified: 2010-03-19


Instead if trying to explain it, I created a diagram that best illistrates it.


Notice that the T1 router is in bridge mode passing all 16 ips thru it.  The diagram shows only 2 of the ips used which is on the WAN side of the 2 D-link routers.  Their output ends up at the same switch, and all components share the sam 192.168.0 network.  All internal netmasks are

Is there anything wrong with this because from the outside I am able to ping both D-link routers, however one of the routers is not forwarding its traffic to the netcard that is listening for it.  I know that the card is listening because I can enter the local IP from another local machine and it works fine.  Both routers are also pingable from the outside and inside...


Question by:stanlyn
    LVL 79

    Expert Comment

    Problem is that your server can only have one default gateway, and it points to which D-Link?
    What exactly are you trying to accomplish? It's not a simple problem to provide multiple paths to one server using commodity consumer gear and Windows.
    LVL 8

    Expert Comment

    The computer is not responding because this router is not its default gateway. I don't see why you need 2 DI604. If you need a redundant architecture, use 2 corporate class router in cluster.
    LVL 9

    Expert Comment

    I would get rid of the Hub and 1 dlink, and it would work beautifly.
    having 2 dlinks should work yes, but you would have to change the default gateway anytime one of them droppe.d

    Author Comment

    The reason is...

    The T1 and its associated Netopia router is passing 16 external IPs thru to the local network via bridge mode.  These ips range from x.x.178.99 thru x.x.178.116 with the Netopia router being x.x.178.99.

    One of the servers has a single nic card that has, 19, and 20 bound to it.  This server has two web sites with one going to 0.18, and the other goes to 0.19, while 0.20 goes to a mail server.

    The D-link router can only be assigned a single external ip, so we assign it external 178.100 where I nat anything that comes in on it to internal 0.18, and likewise to the others.

    I did not expect a problem, because every device has a unique non-duplicated ip address on the same network, both internal and external, but there is.

    Any ideas, other that throwing $1000+ to a different router?  I currently have 4-5 of these D-Link routers and a couple Netgear ones FVS318 and FVR328 which could be used.

    LVL 79

    Accepted Solution

    Swap out the Netopia and both D-Links for most any Cisco T1 router, or even a low-cost Adtran 3200.
    One other option would be a $250 Linksys RV041/ $165 RV042 which will allow multiple static nat mappings where you can do it with just one router.
    Another option would be to swap both D-links for a Cisco PIX501
    Your Netgears only support many-one nat, and you need 1-1 nat.
    LVL 16

    Assisted Solution

    >The T1 and its associated Netopia router is passing 16 external IPs thru to the local network via bridge mode.  These ips
    >range from x.x.178.99 thru x.x.178.116 with the Netopia router being x.x.178.99.

    I don't know why you keep saying the router is in "bridge mode" if your local clients still need to use it's assigned IP as their respective gateway.  If your (b)router is in bridge mode, then your local clients should be configured with a gateway IP that does not reside on your router...  Just because your router has the same IP for it's internal and external interfaces does not mean it's "bridging" your traffic (I am well aware of the practice of assigning the same IP to the internal and external interfaces of Netopia devices - I still think it's retarded).

    I think you are confusing basic routing with actual bridging.

    I will admit that my definition of bridges is a bit hazy, as I don't tend to engage in debates about bridging equipment very often, so I may likely be opening myself to a spanking by those with more knowledge pertaining to the relevant RFCs...

    In any case, go with lrmoore's advice.

    LVL 9

    Expert Comment

    Bridges & switches are a layer2 device, the perform no layer3 routing.

    Another solution would be get ride of the routers all together, and assign the real IP's to the servers......

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    Highfive + Dolby Voice = No More Audio Complaints!

    Poor audio quality is one of the top reasons people don’t use video conferencing. Get the crispest, clearest audio powered by Dolby Voice in every meeting. Highfive and Dolby Voice deliver the best video conferencing and audio experience for every meeting and every room.

    When posting a question about a Cisco ASA, Cisco Router or Cisco Switch, it can aid diagnosis if a suitably sanitised copy of the config is provided. It is much better to leave as much of the configuration as original as possible, as it could be tha…
    Before I go to far, let's explain HA (High Availability) and why you should consider it.  High availability is the mechanism used to provide redundancy to any service at the same site and appears as a single service to the users of that service.  As…
    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…
    In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor ( If you're interested in additional methods for monitoring bandwidt…

    737 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