I believe a lot of folks have transfered their DNS server IP addresses when moving to different provider.. I have a quick question:

will all registrars will update the DNS server new IP address or for some domains the old DNS server IP will be left as it is and it should be done for each domain by hand?

Originally posted by apollo

will all registrars will update the DNS server new IP address or for some domains the old DNS server IP will be left as it is and it should be done for each domain by hand?

All registrars pull host (nameserver) information from a central database. If you are moving, I would recommend planning for 72 hours of overlap before shutting down the old name server -- some registrars are slower to update than others.

The TTL value or Time To Live timer in the CNO root servers is set to 48 hours.

The zone files are updated from the registry every 12 hours.

Assuming that your registrar updates the registry in real time when you change the IP addresses for your nameservers, the new information will be in the root servers within 12 hours, and then you are simply waiting for propagation.

This is where the problems generally occur.

DNS information is not PUSHED around the Internet, it's pulled. This includes the IP addresses of your nameservers. If a particular ISP has cached your DNS information, and it ignores the TTL value from the root servers because it's misconfigured, it may take much longer than the theoretical 12+48 hour maximum to query the root servers for your updated data.

I've seen DNS caches not update for as long as three weeks when moving a site from one place to another.

There are some ISPs who ignore the TTL values and query the root every time, or on their own schedule. These are equally poor Internet neighbors, however their customers will see root changes in near real time.

Isn't the DNS fun :).

-t

Originally posted by thewitt

Isn't the DNS fun :).



Not as much fun as DNSSEC :D.

hmm sounds strange

thewitt,
Good information. Thanks. :agree:

Thank you all for your info/feedback ;)