Dual router to wan problem

Discussion in 'Windows Networking' started by Marshall Lai, Oct 14, 2004.

  1. Marshall Lai

    Marshall Lai Guest

    Here is my setup:

    Router 1:
    LAN IP
    external domain name: a.mydomain.net
    port 80 forwarded to

    Router 2:
    LAN IP
    external domain name: b.mydomain.net
    port 80 forwarded to

    Webserver (WS2003)
    Default Gateway:,

    I would like to be able to access the webserver from both a.mydomain.net and
    b.mydomain.net. I can access the site via a.mydomain.net but not
    Is this because the server is using as it's default gateway? Is
    there anything that I can do (keeping both routers on the same subnet) that
    make this work?

    Your input is much appreciated
    Marshall Lai, Oct 14, 2004
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  2. not sure the settings. Assuming all of the computers are in the same subnet,
    they should be able to see each other and default gateway is not issue here.

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    Robert L [MS-MVP], Oct 14, 2004
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  3. No.
    It doesn't matter if they are in the same subnet or not and it doesn't
    matter what the Default Gateway is because you can only have one anyway.

    One possibility would be with a *single* router that has two public
    interfaces with each representing one of the domains. The device would then
    have to forward port 80 traffic to the web server from "either/or" of the
    two external links. The Device may also be required to have load balancing
    features where it can balance between the two exteranl links.

    The second possibility with two routers would be to have one of the two
    routers forward port 80 to the *extenal* interface of the other router (if
    they are capable of doing so).

    The *right* way to do this would have been to used a *single* Internet link
    that has enough bandwith to serve the purpose, then have *both* domains
    registered to the same IP# of the single router on the single link.
    Phillip Windell, Oct 14, 2004
  4. Marshall Lai

    Marshall Lai Guest

    Yes the computers and devices can see each other in the network with no
    The problem lies in external connections coming into the server. The server
    will only send the response to the default router no matter which router the
    external request comes thru from.

    For example, the server is configured with as it's default
    router. And an external connection thru the second router is
    forwarded to the server. The server will only respond to this request thru
    the default router which is so as a result, the client
    connecting thru from will not see the website......
    Marshall Lai, Oct 14, 2004
  5. Yes, and that is all it will ever do. That is the way it is supposed to
    work. It looks at the IP# of the destination and compares it to the Routing
    Table and follows the path that applies,...which will always be the Default
    Gateway. Only "established" or "known" routes/destinations will follow
    other routes if other routes are specified for those particular

    See my other post.
    Phillip Windell, Oct 14, 2004
  6. Marshall Lai

    Marshall Lai Guest

    In this case, if the single link fails, then there will be no
    The forwarding to port 80 to the external interface of router 1 solution
    seems interesting and let me try this out.....
    Marshall Lai, Oct 15, 2004
  7. The proper way to have redundant lines is to work that out with the Internet
    Provider so that each redundant line comes from the same provider and uses
    IP#s from that same provider. The ISP's equipment on their end plays just
    as big a role in the "redundancy" as does equipment on your end,....so the
    two of you have to work together the make it happen. An ISP's that
    specializes only in "Home user" situations will probably not be able to do

    There are also Cable/DSL Routers that have duel WAN ports and can
    load-balance/fail-over between them. You'll have to investigate the features
    of diffeent models yourself,..I have no dealings with any of those.
    Phillip Windell, Oct 15, 2004
  8. Marshall Lai

    Marshall Lai Guest

    Thanks. That's what I ended up doing. I bought the Linksys RV042 PN router
    with can do 2 WAN(Load balance and/or failsafe), DDNS on both WANs and VPN
    IPSEC. I just pass-thru pptp to my WS2003. And now everything is

    Marshall Lai, Oct 16, 2004
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