Two Authoritative servers

[Kevin Darcy]

Chris wrote:

>"Rodney" <rolson at myrealbox.com> wrote in message 
>news:d3pbqh$78j$1 at sf1.isc.org...
>  
>
>>I have switched ISPs and I need to change my domain registration to
>>reflect the new Name servers. The registry will not change the info
>>until my new ISP's DNS servers are Authoritative for our domain.
>>Currently our old ISP is still the Authority for our domain. Can I have
>>the New ISP make entries in their Name servers as SOA for our domain
>>and keep the old ISPs entries as the SOA until the domain registry
>>makes their changes?
>>
>>Rodney
>>
>>
>>    
>>
>
>Yes. The new ISP can set up their DNS servers to accept queries for your 
>domain and create the necessary zone file so that when the registry changes 
>the delegation, you have a transparent changeover. If they switched the 
>delegation before the servers had been configured with your zone then you 
>risk DNS failing for your domain until they do the work.
>
>When we get a domain transfer in we first look up the incumbant data for the 
>zone and any other info provided by the owner of the domain and set up the 
>zone file on our master so that when the domain arrives with us it all works 
>straight away and the customer does not suffer any loss of service (mail, 
>www etc.).
>
Um, but what happens if they *change* their zone data before the zone 
gets delegated to you? Now you're serving up stale data. This needs to 
be a closely co-ordinated effort if you want to make it completely 
transparent. Don't forget about the step of getting the zone deleted 
from the old nameservers, otherwise the customer may experience the 
effects of "server lock".

                                                                         
                                                      - Kevin