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Using two IP addresses

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Using two IP addresses

tonitershe
I am currently using two Public IP addresses in our company, each one from diferent ISP. The main reason is to have a back-up line in case one of them drops. I have succesfully configured a load balancing.
My point is, there other members of our company which work outside of our LAN, so they do connect to our server (mail server) using the Public IP. Now that we have two of them, how can I configure their connection to use the other IP in case the other one is down?

Any help or direction?

Thank you Toni
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    Why Me Worry?

    I'm not sure about the exact intricacies of how it works and how it's configured per se, but I've seen this done with content switches and I can attest to the fact that it does work. I've seen layer 4 switches used to control traffic flow to a farm of web servers and will immediately switch traffic over if one server goes down.

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    tonitershe

    You are talking abiut switches which makes me asume this is at LAN Level. A useful information, but anyway i was talking about WAN level with public IP. I mean if I have one IP 82.74.xxx.xxx and another 68.54.xxx.xxx, let's assume I use the first as default for connections from the outside, in case this one drops i would like to redirect the connections to the second IP.

    In my guess this will call some DNS configuration, but I don't know how. I have done some search but can't find anythong, probably using wrong keywords in my search.

  • +
    0 Votes
    Why Me Worry?

    I'm not sure about the exact intricacies of how it works and how it's configured per se, but I've seen this done with content switches and I can attest to the fact that it does work. I've seen layer 4 switches used to control traffic flow to a farm of web servers and will immediately switch traffic over if one server goes down.

    +
    0 Votes
    tonitershe

    You are talking abiut switches which makes me asume this is at LAN Level. A useful information, but anyway i was talking about WAN level with public IP. I mean if I have one IP 82.74.xxx.xxx and another 68.54.xxx.xxx, let's assume I use the first as default for connections from the outside, in case this one drops i would like to redirect the connections to the second IP.

    In my guess this will call some DNS configuration, but I don't know how. I have done some search but can't find anythong, probably using wrong keywords in my search.