Do i need 2 IPs for 2 Dns ?

Discussion in 'Server Operation' started by kadi, Sep 15, 2011.

  1. kadi

    kadi New Member

    I am using CentOS 6.
    I tried to get 2dns form my registry and they told me they need 2 ips for 2 dns if i supply only one ip i get one dns, also they will not accept the static IP from my router, i don't know if what they saying is right ! i used one ip before and 2 dns, so that raised another question: how i will put 2 ips if i can get them on the network connection on eth0 ? or in hosts file ?
    Thanks in advance for help will be appreciated.
    Last edited: Sep 15, 2011
  2. falko

    falko Super Moderator ISPConfig Developer

    Each registry handles this differently. Some might accept one IP, some require two, and some others even need the IPs to be in different subnets.

    In fact you gain no reliability by using just one IP, because if that system fails, both nameservers are down.

    And it makes no sense ti run two nameservers on different local IPs behind a router because you can forward port 53 (TCP and UDP) to just one local IP.
  3. kadi

    kadi New Member


    hello mr/Falko
    Thanks much you explained clearly to me and i thank you for
    that and for your reply.

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