move nds server to a different subnet

[Kevin Darcy]

Julie Xu wrote:

> Dear all,
>
> I need move our dns server to a different subnet.
>
> It is a second dhs server, but, it is the only dns server in the campus
> (let us called it dnsA). We have the master dns server in another campus
> (let's called it dnsB).
>
> Our machines in the campus setup their dns server list as first - dnsA and
> second dnsB.
>
> If I just move the dnsA to different subnet, what will happened to all the
> machines.
> Slow? or Stop? If it will be slow, will users notice it?

The speed depends on lots of different factors, but in my experience the
failover delay is not noticeable by most users on most OS platforms, in most
network topologies, assuming the failover server has enough capacity to deal
with the load.

> Can I temperary put a dns server in original address and ask it forward all
> the dns query
> to dnsA? if so, how can I configure it?

Why not just configure it as another slave (aka "secondary")?

> Any comments will be apprecaited

Okay, then: use DHCP to control the resolver list that the clients use. Manual
configuration of resolver lists is for the birds. If you had an easy way to
change everyone's resolver list, then you could do this in a two-step process:
a) change the resolver list to be (master, new address of slave), then b) when
the slave is at its new address, reverse the order of the list.


- Kevin