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Thread: Split-DNS scenario ok, if an additional external mail domain is used ?

  1. #1
    john99 is offline Advanced Member
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    Default Split-DNS scenario ok, if an additional external mail domain is used ?

    Hi,

    we intend to install Zimbra in a test environment behind a firewall in a DynDNS domain with NAT.
    Do to redundancy reasons, we will receive and send our mails through an ISP (external mail domain)


    Is your Split_DNS scenario as well recommended for such an environment?


    Thank's a lot you for any feedback!

    John

  2. #2
    phoenix is online now Zimbra Consultant & Moderator
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    Split DNS is necessary whenever you are behind a NAT device, it makes delivery of mail to Zimbra (postfix) possible.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  3. #3
    john99 is offline Advanced Member
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    Thank's a lot phoenix for your feedback!

    What would be the advantage of installing an internal DNS server in the described environment?


    Thank you in advance for additional help!

    John

  4. #4
    phoenix is online now Zimbra Consultant & Moderator
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    The advantage is that your mail gets delivered. As I mentioned above, Postfix requires it so it can deliver the mail to your server, it uses a DNS lookup to resolve your server address.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  5. #5
    john99 is offline Advanced Member
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    Default local DNS server required?

    Thank's for the reply!

    -> we intend to install Zimbra in a test environment behind a firewall in a
    -> DynDNS domain with NAT.


    My believe was that a local DNS server could offer some benefits, but that it's not a requirement.
    But as I understand you now, a local DNS server is absolutely required...

    Is that the case?


    Thank you very much!

    John

  6. #6
    phoenix is online now Zimbra Consultant & Moderator
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    Yes, that is the case. If you are behind a NAT router or firewall then it is a requirement to have a DNS server. There is a benefit in that you don't have to rely on your ISPs DNS servers for resolution of external addresses.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

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