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Thread: Configuring two zimbra mail server within LAN with split DNS

  1. #11
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    Delivering directly and PTR is setup from ISP side as well

  2. #12
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    Directly with PTR setup from isp

  3. #13
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    The resolv.conf on both server only contains 127.0.0.1 as nameserver?

  4. #14
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    Hi Klug

    Yes, correct that is why it is so confusing...I must be missing something very simple I think, but your assistance is very helpful in double checking all configs.

    Thanks

  5. #15
    phoenix is offline Zimbra Consultant & Moderator
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    Quote Originally Posted by JuniorTux View Post
    Yes, correct that is why it is so confusing...I must be missing something very simple I think, but your assistance is very helpful in double checking all configs.
    Why do you have two different DNS server when one will suffice? If you're having problems configuring your DNS server(s) manually then you should look into using Webmin.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  6. #16
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    Hi Phoenix

    Thanks for your answer regarding webmin.

    The configuring of the settings to do is not the problem, I think it might rather be that everyone interpret the info differently and that is where confusion step in.

    My understanding is with split dns is that there is a "dns" server on the ISP side pointing to your inhouse mail servers via your firewall for inbound mail.

    Your mail server/s can either point to your firewall/dns server or dns server on the mail server incase there is only a firewall with no dns available for outbound mail.
    So either a dns server on the firewall or a dns server on the mail server.

    In the case of dns on the mail server, the forwarders need to be set to point at the ISP's dns servers for resolution of domains.

    In case of the dns being on the firewall, the mail server/s will point to that and zones must be added for those mail servers so that internally the mail servers can resolve as well as users on the local lan.

    This is how I understand it. If am misreading it please correct me.

    Thanks for your time , much appreciated

    Ben

  7. #17
    phoenix is offline Zimbra Consultant & Moderator
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    Quote Originally Posted by JuniorTux View Post
    In the case of dns on the mail server, the forwarders need to be set to point at the ISP's dns servers for resolution of domains.
    I don't have much confidence in ISPs mail server (as a general rule) and prefer to use root DNS servers in the LAN DNS configuration.

    Quote Originally Posted by JuniorTux View Post
    IThis is how I understand it. If am misreading it please correct me.
    Generally your comments are correct, I just prefer to use one DNS server (actually, one master and two slaves for redundancy - the master is the one that gets updated and it automatically updates the slaves) for simplicity rather than have multiple servers that need to be maintained separately. Using webmin makes it trivial to create the zones and DNS records without have to bother about typing or file naming errors.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  8. #18
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    Hi Phoenix

    Yes i also think it would be rather better to have one, less work ;-)

    Would you suggest I use the firewall/dns combination and have the mail servers look at that as the dns or what do you suggest?
    Just remember my mail servers is in a DMZ

    Please advise

    Ben

  9. #19
    phoenix is offline Zimbra Consultant & Moderator
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    Quote Originally Posted by JuniorTux View Post
    Would you suggest I use the firewall/dns combination and have the mail servers look at that as the dns or what do you suggest?
    If that DNS server is visible to DMZ servers (as long as they're not accessible from outside your LAN) and you have access to it then I'd use that.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  10. #20
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    I actually meant that our firewall is also our DNS server. Ubuntu 12.04Lts

    If I use this combination, then my forwarders must point to my firewall and the firewall dns to the ISP, if my understanding is correct?


    Regards

    Ben
    Last edited by JuniorTux; 01-16-2014 at 05:37 AM.

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