Fw: Switching Host

Josh Knepfle josh at sparkpeople.com
Fri Jul 9 13:04:36 UTC 2004


----- Original Message ----- 
From: "Barry Margolin" <barmar at alum.mit.edu>
Newsgroups: comp.protocols.dns.bind
To: <comp-protocols-dns-bind at isc.org>
Sent: Thursday, July 08, 2004 8:22 PM
Subject: Re: Switching Host


> In article <cckmg8$1pv5$1 at sf1.isc.org>,
>  "Josh Knepfle" <josh at sparkpeople.com> wrote:
>
> > "Barry Margolin" <barmar at alum.mit.edu> wrote in message
> > news:cci308$2hiu$1 at sf1.isc.org...
>
> > > What happens is that every time a server queries the old ISP's
servers,
> > > the response includes the domain's NS records in the Authority
section,
> > > and these update the TTLs of those records.  As long as it queries the
> > > old servers more often than the old TTL, the old NS records will never
> > > expire from the cache, and the server will never have to go to the TLD
> > > server to get new NS records.
> >
> > So does this say that unless you have the cooperation of your "old" ISP,
> > people are not going to be able to get to your servers at the new host?
Is
> > this a known issue with the whole system?
>
> Yes, this is a longstanding problem that frequently bites people when
> they switch DNS providers.
>

Just out of curiosity, is there any talk of changing the procedure?  It
would seem that as long as everyone went to the TLD server after the TTL was
expired, this would be resolved (which, it seems, at least some people do).
Or, am I missing something???




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