> Date: Wed, 07 Feb 2001 00:58:24 +1100
> From: [EMAIL PROTECTED]
> Message-ID: <[EMAIL PROTECTED]>
>
> | With re-delgation the NS RRset to be
> | delegated to should be a sub-set of those in the zone as that
> | permits smooth transfer.
>
> That's nonsense - the parent data is just glue, and should always
> be identical to that in the zone itself.
>
> To get "smooth transfer" the new servers should be set up, and then
> the old servers made secondary for that (so they start giving out the
> new data). Then the parent should be updated.
>
> That depends upon the DNS property of there being old data for a while
> after a change (the parent has old data until it s updated) but never
> does the data held by the parent not reflect the data in the autjoritative
> zone file, at some particular point in time.
>
> Allowing configurations where the new servers list the old servers just
> begs for the new servers to do that, without the old servers ever having
> any idea it is happening - which is a genuine recipe for making a
> gigantic mess.
>
> kre
>
Robert you are reading more into the statement than was there.
We know that disjoint set of nameservers in the parent and
child cause problems.
Now lets say you have the old and new servers that are disjoint
sets. There are two ways to do this.
We are going from old to new. All child servers are serving
the same zone contents.
Subset.
Parent old Child old
new servers commissioned
Parent old Child old + new
inform parent
Parent new Child old + new
Parent new Child new
ttls expired, old servers de-commissioned
Or
Forced match.
Parent old Child old
new servers commissioned
Parent old Child old + new
inform parent
Parent old + new Child old + new
Parent old + new Child new
inform parent
Parent new Child new
ttls expired, old servers de-commissioned
I am not saying
Parent old Child old
new servers commissioned
Parent old Child new *** broken zone ***
inform parent
Parent new Child new
ttls expired, old servers de-commissioned
Mark
--
Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: [EMAIL PROTECTED]
