Using Primary & backup Internet Connection Real Time
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  1. #1
    Did someone said Pizza :) FanacooL's Avatar
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    Using Primary & backup Internet Connection Real Time

    Hi!
    I have two internet connections, primary Radio Link while secondary Satellite connection. Both of the links from the same ISP and have same Real IP. Whenever the primary link goes down one have to manually turn on the backup connection and sometimes this downtime really impact the online application we are running.

    Now the scenario is like this Internet connection is terminating from there Indoor unit / Modem into my Cisco 800 series router. There is a VPN connection established through that router on that particular real IP.

    So the reason of having same IP on both Internet connection is simply enabling the backup link once the primary goes down and without making any change in the configuration at my end as well as site (where the VPN concentrator is risiding).

    Now there is a limitation that i can have only 1 VPN connection from the reomote site.

    => How can i achieve real time backup connection (without manually changing the connection)? I have read about Tracking option in router but will it work in my case as i can have only 1 VPN connection!


    I have seen this thing implemented in another scenario, where primary connection was terminating in E1 port of router and backup in FastEthernet ports with Internal network, using VLAN to isolate the internal traffic with that backup conection.
    One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man!

  2. #2
    Just Another Geek
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    Both connections use the same IP so that would make it difficult if not impossible. If they used different IPs they could both be 'online' and by making use of metrics in your routing table it would use one connection. When that goes down it'll take the other route. It would still mean your VPN will go down momentarily but it should restore (basically redial) and use the other connection.
    Last edited by SirDice; November 29th, 2007 at 08:36 AM.
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  3. #3
    Did someone said Pizza :) FanacooL's Avatar
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    But having different IP's mean i should have two VPN different VPN connection, which is not possible!
    One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man!

  4. #4
    Just Another Geek
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    No you still would have 1 VPN connection at any one time.
    Oliver's Law:
    Experience is something you don't get until just after you need it.

  5. #5
    Did someone said Pizza :) FanacooL's Avatar
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    Obviosuly yes but the restriction is I can have one VPN connection only! With two IP's i have to register two VPN connections right ?
    One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man!

  6. #6
    Did someone said Pizza :) FanacooL's Avatar
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    Just a thought came in mind!
    What if I introduced a Switch and terminate both connections in it, when one goes down other gets UP automatically just like Spanning Tree Protocol. Is it possible ?
    One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man!

  7. #7
    Just Another Geek
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    No, both links use the same IP address, you'll get an IP conflict.
    Oliver's Law:
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  8. #8
    Just Another Geek
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    It's more or less like this:

    Code:
    [vpn box]-------------[router1]------>link1
                   \------[router2]------>link2
    The outside addresses of the routers are different or you won't be able to get the links online (ip conflict at the ISPs end). The VPN would choose which router based on the routing metric.
    Last edited by SirDice; November 29th, 2007 at 08:50 AM.
    Oliver's Law:
    Experience is something you don't get until just after you need it.

  9. #9
    Did someone said Pizza :) FanacooL's Avatar
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    The link is in between VPN box and the Router!!!!

    Remote Site
    VPN BOX---------------ISP Link --------- My Router
    One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man!

  10. #10
    Just Another Geek
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    I have two internet connections, primary Radio Link while secondary Satellite connection.
    Means you have 2 ISP links.
    Oliver's Law:
    Experience is something you don't get until just after you need it.

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