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Thread: Re: Installing Zimbra behind Firewall

  1. #1
    senthilkumar84_2000 is offline New Member
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    Default Re: Installing Zimbra behind Firewall

    Hi,

    I have a Mail server (Exchange) already configured behind the firewall with proper MX and A record and working fine,

    A record email.example.com 10.10.10.1 (Public IP)
    MX record example.com email.example.com (priority 0)

    But i decided to migrate to zimbra without disturbing the present mail server,so i created one additional A and MX record in my DNS provider control panel with low priority (10) for new mail server mail1.example.com pointing to 10.10.10.2 (public IP)

    These are the configuration:

    Cent OS 5.1

    Zimbra 5.08 (Opensource Edition)

    my /etc/hosts file is

    127.0.0.1 localhost
    192.168.1.254 mail1.example.com mail1


    My /etc/sysconfig/network

    NETWORKING=yes
    HOSTNAME=mail1.example.com


    i forward port 25 from firewall to this machine (10.10.10.2:25 to 192.168.1.254:25)

    Now the problem is when i try to install the Zimbra it says unable to resolve the MX record..this is the following Error


    DNS ERROR resolving MX for mail1.example.com
    It is suggested that the domain name have an MX record configured in DNS
    Change domain name? [Yes]
    Create Domain: [mail1.example.com] example.com
    MX: mail1.example.com (10.10.10.2)
    MX: email.example.com (10.10.10.1)

    Interface: 192.168.1.254
    Interface: 127.0.0.1


    DNS ERROR - none of the MX records for example.com
    resolve to this host


    So please say your valuable solutions to Fix this issue...


    Thanks.
    Senthilkumar84_2000
    Last edited by senthilkumar84_2000; 09-08-2008 at 05:34 AM. Reason: Typing error

  2. #2
    uxbod's Avatar
    uxbod is offline Moderator
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    Default

    You will need to implement a Split DNS - Zimbra :: Wiki architecture.

  3. #3
    senthilkumar84_2000 is offline New Member
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    Default

    Thanks for your valuable solution..i will try that now, so if this works fine i will replace the existing one to zimbra, after that i need to remove the local DNS split? to act as a primary machine...Please suggest me how to do this?


    Thanks,

    Senthilkumar84_2000

  4. #4
    uxbod's Avatar
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    You can leave the external DNS as is, but the reason for the Split DNS is so that a MX record for your ZCS installation is available on your internal LAN. You can install BIND on your ZCS server, and the only thing it really needs is the A and MX records (note: if you are not using your ISP to relay outbound email then it will need to be able to resolve external domains aswell).

  5. #5
    ceefus is offline Active Member
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    Default ?

    I'm confused.. Why do we need this? Would it work if I ran a VPN? I don't understand why if everything forwards why it won't resolve them?

  6. #6
    uxbod's Avatar
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    If you are behind a firewall on a private LAN IP then ZCS does still require the ability to resolve a MX and A record that matches the IP address of the host machine. If you went out to a external DNS then that would reply with the external IP and not the internal one. Whether ports are forwarded or not ZCS still needs name resolution to be in place.

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