Using Backup Routers With Windows XP and Windows 2003 Clients

Discussion in 'Windows Networking' started by Will, Sep 17, 2006.

  1. Will

    Will Guest

    If you give a Windows XP or Windows 2003 client multiple gateways, and
    establish one with a metric of 1 and the other with a metric of 2, is
    Windows capable of detecting the failure of the router with metric 1 and
    automatically switching over to the other router?

    I vaguely remember that doing this with real routers requires a routing
    protocol in order for the router to figure out that one of its upstream
    routers is no longer available. Protocols like RIP are a hassle, and I
    certainly don't want that on the clients. I'm hoping Microsoft has its own
    technology for detecting this situation and allowing the client to use the
    alternate router.

    I realize that one could delegate all of this to the router itself, but that
    creates a single point of failure in the network, and I'm toying with
    options to make things more robust for clients without introducing "high
    availability" versions of routers and firewalls that are more expensive,
    difficult to configure, and more difficult to keep running. If the clients
    could automatically react to a router or firewall failure on their own and
    switch to an alternate, things could be made very robust with minimum
    Will, Sep 17, 2006
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  2. Miha Pihler [MVP], Sep 17, 2006
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  3. Will

    Will Guest

    So if I read this article correctly, we can use DHCP to configure two
    default routes for every Windows computer on our internal network. One of
    those will be a primary with metric 10 and the other is the backup with
    metric 20. For just TCP-based activity, any Windows client will
    automatically detect a failed router after three attempts to connect through
    it and then switch over to the other router for that connection.

    The key thing is to not have routers on multiple interfaces. But multiple
    routers on a single interface, when the metric makes clear which is the
    primary, should work reliably.
    Will, Sep 18, 2006
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