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Exchange and Multiple Public IP Addresses

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  • Exchange and Multiple Public IP Addresses

    Hi,

    I have two different isp connections (12m/2m & 10m/10m) Would it be possible to configure redundant connection using public static ip of each isp (I have setup reverse dns) to deliver mails to my exchange server? (2003 sp2).

    Thanks

  • #2
    Re: Exchange and Multiple Public IP Addresses

    Sure can but need more info about your setup.
    What kind of gateway device do you have, can you have dual WANs, and can you assign them the public IPs, and then route to exchange.

    On the DNS side you will have to create 2 MX records, same priority, like mail1.example.com and mail2.example.com.

    Dont forget to create the A records for the domains above to the IPs of each ISP.
    "...if I turn out to be particularly clear, you've probably misunderstood what I've said” - Alan Greenspan

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    • #3
      Re: Exchange and Multiple Public IP Addresses

      You will need either a dual WAN router or second server to accept the traffic, because you can only have one default gateway per machine.
      Therefore this isn't strictly an Exchange issue, but a Windows/networking issue.

      A dual WAN router is probably the best option, then traffic just appears to be coming from a single source as far as Windows is concerned.

      However, while you can configure a PTR on each static IP address, Exchange can only announce one of them. Therefore you will have to decide which IP address traffic goes out of your network on, and ensure that all settings for that connection are correct. If you want traffic to leave on both connections, then the best way to ensure email is being delivered correctly is to have some kind of relay host external to your network and then send email through that. I have multiple connections at home and that is what I do. It doesn't matter how the traffic gets to my relay host, the delivery on from that point is all that matters.

      Simon.
      --
      Simon Butler
      Exchange MVP

      Blog: http://blog.sembee.co.uk/
      More Exchange Content: http://exchange.sembee.info/
      Exchange Resources List: http://exbpa.com/
      In the UK? Hire me: http://www.sembee.co.uk/

      Sembee is a registered trademark, used here with permission.

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      • #4
        Re: Exchange and Multiple Public IP Addresses

        Hi Lior & Sembee,

        I will try the suggestions. Sembee - as far as utilising an external relay host, that would only be for outbound emails (from my exchange server) correct?

        Thanks for the help.

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        • #5
          Re: Exchange and Multiple Public IP Addresses

          Outbound only. Inbound it doesn't matter, but for outbound, if things aren't exactly correct then email will be bounced by antispam measures.

          Simon.
          --
          Simon Butler
          Exchange MVP

          Blog: http://blog.sembee.co.uk/
          More Exchange Content: http://exchange.sembee.info/
          Exchange Resources List: http://exbpa.com/
          In the UK? Hire me: http://www.sembee.co.uk/

          Sembee is a registered trademark, used here with permission.

          Comment

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