Domain Name Registrar - Changing NS records - propagation time

Posted on 2009-12-16
Last Modified: 2012-05-08
Hey guys.

I have an ISP switchover that I am doign this weekend as well as switching over domain name hosting on 3 domains. Looking for some advice/tips to ensure this goes as smoothly as possible.

I have created the 3 DNS zones on a public DNS server with update ip addressed of the new ISP. I have the logins for the 3 registrars for the 3 domains that i will need to switch over.

Should I switch the ISP and registrar NS records all at once or space it out a bit.

Thanks for your help
Question by:dirkdigs
    LVL 2

    Expert Comment


    do you have some architecture description? It is hard to determine all possible issues that could potentialy arise.

    From my best practice, it is best to setup the new servers completely behind the new isp infrastructure, including dns setup as secondary servers with extra new A records. Every server then will have two A records on DNS server. When the records are working and are tested from outside, delete the old ISP records, wait 48 hours to ensure replication and then disconnect the old ISP. Same approach is possible with multiple DNS servers from different ISPs. When the new servers are fully functional and tested, wait 48 hours for replication and terminate old zones.
    LVL 18

    Expert Comment

    by:Andrew Davis
    i am assuming that you are n0ot going to have both ISP connected at same time. eg cut ISP 1, then connect ISP 2.
    DNS Propergation can take up to 72 hours, but in my experiance 99% done in 8hrs.

    if this was mission critical that the services remain up then you would have both ISP's connected at the same time to allow for DNS propergation. Then disconnect the second service.

    LVL 2

    Accepted Solution

    Yeah like I said, if you want to keep you services up, you should have the both ISP connected at same time during cutover...

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