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Thread: Change IP of mailstore and repoint Zimbra Proxies to it?

  1. #1
    Join Date
    May 2014
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    Default Change IP of mailstore and repoint Zimbra Proxies to it?


    We are putting a shared IP in between our 2 mailservers that are in sync with DRBD.

    It started off as 1 proxy and 1 mail server. Initially, the proxy was pointed directly at the mailstore ( with IP of . Since then, we have added a 2nd Mailstore with IP of and is in sync with the primary using DRBD.

    We have added a shared IP between them using Pacemaker (similar to CARP, UCARP). The shared IP is

    How do I get the proxies pointed at this new IP of

    I have setup split DNS, and the hostname is resolving to the new IP.

    [root@proxy1 ~]# nslookup
    Restarted Zimbra Proxy

    I edited the Proxy1 hosts file so that is
    cat /etc/hosts
    Restarted Zimbra Proxy

    Setup DNSMasq

    cat /etc/resolv.conf
    [root@proxy1 ~]# nslookup
    Once again I restarted Zimbra Proxy.

    No matter what I do, the proxy continues to connect to

    I even went as far as rebooting the Proxy1 server since I thought perhaps things were cached.

    At this point, the only solution I can think of is to make an iptables rule that redirects my packets destined for to

    Hopefully someone can shed some light. I have looked through the forums.

    Came across:
    Change IP Address
    Which they tell the guy to make sure DNS resolves..Which it does.

    And basic netcat tests to works fine on every port.

    TCPDUMP shows all packets leaving the Proxy1 server going directly to

    All servers are running CentOS 6.5 stable with the latest version of Zimbra 8.0.7 Open Source edition. All firewalls have been disabled so that can not be the problem.

    Is there some place where the IP address is cached?

    Thanks for any help.

  2. #2
    Join Date
    Oct 2012
    Rep Power


    Well I guess since changing the IP of a mailstore is apparently impossible, we were able to get by with adding this iptables rule to each of our proxies.

    iptables -A OUTPUT -d -j DNAT --to-destination


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