Why must you use a static IP for DC?

January 14, 2011 at 12:30:00
Specs: Windows 7
(DC = domain controller) Very sorry for such a noob question. I am tasked with explaining this in plain language for a class but not sure I understand myself. Is it for speed sake or for security or some other reason? As I understand DNS it would always be able to find the server even if the IP changed right? Or is there something involved that would prevent DNS from finding the new IP? Thanks!

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January 19, 2011 at 07:55:04
It would find it eventually. DNS records are not updated instantly, so in the time between the changing of the IP address, it is possible, in fact likely, that the old address would still be referenced. Functions that would require the DC would be sent to the old IP address and would fail, causing all sorts of issue.

Also, that DNS information is replicated to all other DCs. Replication would fail because other DCs would be sending to the old IP address.

It would be a mess.

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January 19, 2011 at 08:33:12
That explains it very well. Thank you!

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