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List:       outages
Subject:    Re: [outages] Belkin [heartbeat.belkin.com]
From:       Jay Ashworth via Outages <outages () outages ! org>
Date:       2014-10-12 21:36:22
Message-ID: 12907239.5241.1413149782404.JavaMail.root () benjamin ! baylink ! com
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----- Original Message -----
> From: "Michael Loftis via Outages" <outages@outages.org>

> It's not just the local. 8.8.8.8 is caching the old entry still.
> Check the authoritative resolvers.

Point of order:

No "resolvers" are "authoritative".  "Resolvers" (or, more fully, "Customer
resolver servers") are servers operated (generally) by "eyeball carriers" 
for their end-users to utilize to do DNS lookups, so that the end users
are not required to operate a resolver themselves -- which most enduser 
operating systems have not, historically done.  Resolvers do the recursing
for you, and return a non-authoritative response.

Putting this at the ISP level leverages caching (though sometimes 
pathologically).

Many edge routers perform this task, though not all.

"Authoritative" is a term used to describe a "Zone" server; one which has
a current local or slaved copy of the actual source data for a zone.  
Queries directly to a zone server will have the authoritative bit set.

Cheers,
-- jra
-- 
Jay R. Ashworth                  Baylink                       jra@baylink.com
Designer                     The Things I Think                       RFC 2100
Ashworth & Associates       http://www.bcp38.info          2000 Land Rover DII
St Petersburg FL USA      BCP38: Ask For It By Name!           +1 727 647 1274
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