How to setup a backup NameServer?

Steven Carr sjcarr at
Sun May 4 08:26:00 UTC 2014

On 4 May 2014 02:15, houguanghua <houguanghua at> wrote:
> These zones are not owned by ISP, such as:,
> If such backup dns server is ready, ISP will talk to these WEB sites to keep
> synchronization with their authority NSs.
> It's maybe a huge project.

It's an impossible project. Exactly how are you going to handle DNS
records that only have a 30 second TTL? Sites have TTLs that low to
allow /them/ to cope with DR/failover scenarios. If you are keeping
old DNS records past that TTL then when the site itself has changed to
a different IP you are still going to be handing out the old IP
address to your users. And equally the site may have a custom DNS
implementation which gives you different IP addresses through
round-robin/load balancing, how will you handle this? You will have no
knowledge of their DNS infrastructure to determine how/what they are
doing to return the correct records.

Please go and read on how DNS actually works and use it properly
instead of trying to invent a method which just wont work. You have no
control over the Internet, so don't try to control it.


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