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DNS TTL question

Posted on 2010-09-02
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Last Modified: 2012-05-10

Hi, I moving domains on a server to a new provider, I have my own nameservers and will be switching the IPs associated with each nameserver at the time of the move.

My question is how long should I expect it to take before the new IPs for the nameservers become active and the old ones are forgotten.

Is this related to the TTL shown next to the nameservers here:

http://my-addr.com/domain-hostname-dns-records/isp-country-geo-ip-location/online-nslookup-tool/domain_info.php?domain=olicentral.com&x=0&y=0

(you'll need to scroll down)

thanks for any insight.

Joe
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Question by:SimpleJoe
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Expert Comment

by:Chris Dent
ID: 33587358

The TTL set on the NS records for that domain is 48 hours. The site you've linked doesn't show the total TTL, only the current TTL remaining on a cached record.

Therefore you should expect remote servers to hold the current records for up to 48 hours from the point you make the change.

Chris
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Author Comment

by:SimpleJoe
ID: 33587659
Hi Chris, one question: where would I go to have the TTL for the nameservers changed to 600 seconds? (my registrar? my current provider?)

ps: the URL above seems to show a TTL of 600, not sure where are you seeing 48 hours


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Expert Comment

by:Chris Dent
ID: 33587718

Okay, I was a bit confused about which part was troubling you :)

So the 600 seconds is for the NS records, and the 2 days for the A records associated with those ns records. See:

nslookup -q=ns -d2 olicentral.com ns4.ezpublishing.com

How long you have to wait depends on exactly what you're changing. If you change the A records for the name servers you have to wait 2 days. If you change the ns records themselves it's 10 minutes.

Chris
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Author Comment

by:SimpleJoe
ID: 33587852
Hi Chris, ok that helps a lot.

Last question: where do I go to adjust the A record TTL so that when I change the IPs for the nameservers it happens quicker than 48 hours?  my registrar? or my current provider where the name servers are?
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Accepted Solution

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Chris Dent earned 2000 total points
ID: 33587879

The 48 hour limit is applied both on your system and at the parent. You can change the TTL for your own (potentially), but you won't be able to do much about the entries at the parent.

So...

Your for records you'll go to your current provider. For those at the parent you'll just have to put up with it :)

Chris
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