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Re: Gothcas of changing the IP Address of an Authoritative DNS Server

  • From: bmanning
  • Date: Wed Dec 14 11:55:59 2005

On Wed, Dec 14, 2005 at 10:02:56AM -0500, Joe Abley wrote:
> On 13-Dec-2005, at 16:28, Steven M. Bellovin wrote:
> >In message  
> ><>, Sam Cr
> >ooks writes:
> >>
> >>I would think you would want to drop your DNS record TTLs for all
> >>domains being moved to something very low several days before the
> >>switch-over period.
> >
> >More precisely, you want to change the TTL on the NS records, which  
> >are
> >in the parent zone.  If you're keeping the name but changing the
> >address, worry about the A records, too.
> You also want to check all the registries which are superordinate to  
> zones your server is authoritative for, and check that any IP  
> addresses stored in those registries for your nameserver are updated,  
> otherwise you will experience either immediate or future glue madness.
> A conservative approach to this kind of transition is to arrange for  
> your nameserver (or different nameservers hosting the same data) to  
> respond on both the old and new addresses, and to continue in that  
> mode until you see no queries directed at the old address for some  
> safe-seeming interval (bearing in mind TTLs and cached records,  
> alluded to by Steven and Sam).

	currently in the middle of such a safe, conservative 
	transition leads me to believe that there will -NEVER-
	be a point w/ there are no queries to the old address.
	(he says, 24 months into a transition...)  The right 
	tactic is to make the change, based on 2x the TTL of the SOA.

> Joe

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