No, I'm saying the root servers change at midnight. After that it's up to
all the other DNS servers to respect TTL.

----- Original Message -----
From: "Tom Meunier" <[EMAIL PROTECTED]>
To: "Exchange Discussions" <[EMAIL PROTECTED]>
Sent: Friday, January 11, 2002 11:16 AM
Subject: RE: DNS Changes take how long


I stand by my contention that it will take on average 1/2[TTL].  If the TTL
is 60 seconds, it will seem immediate (but given a statistically significant
sample will actually average 30 seconds).  Surely you're not saying that
every caching DNS server in the world clears its cache at midnight EST?

> -----Original Message-----
> From: Daniel Chenault [mailto:[EMAIL PROTECTED]]
> Posted At: Friday, January 11, 2002 10:43 AM
> Posted To: MSExchange Mailing List
> Conversation: DNS Changes take how long
> Subject: Re: DNS Changes take how long
>
>
> Supposed to happen every 24 hours at midnight EST. Give it 24
> hours after
> that to propogate.
>
> ----- Original Message -----
> From: "Tony Hlabse" <[EMAIL PROTECTED]>
> To: "Exchange Discussions" <[EMAIL PROTECTED]>
> Sent: Friday, January 11, 2002 9:58 AM
> Subject: DNS Changes take how long
>
>
> >
> > Well we are making the switch from a Eudora email server to
> a Exchange
> 2000
> > setup. The new Zone records will be sent to our ISP Verio.
> We are hoping
> all
> > updates to other DNS servers will in place by Monday.
> Anybody think it
> will
> > take longer than 48+ hours. We make the change request
> today at noon.
> >
> >
> > _________________________________________________________________
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> >
> >
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