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Re: [dnsop] DNS Anycast revisited (fwd)
TV> Date: Tue, 3 May 2005 22:21:45 -0400 (Eastern Daylight Time) TV> From: Todd Vierling [ trimming CC list before it grows too long ] TV> And last time I checked -- on this list, mind you -- it certainly TV> was not. Cf. people trying to run and hide, or lash out at me for TV> complaining, when I pointed out how two anycast routes pointing to TV> the same dead node made the .ORG anycast implementation unusable. Akamai's service uses non-coherent DNS by design. Your post referenced a failure case in which DNS service was not coherent by virtue of certain pods not responding; UDNS attempts to provide coherent DNS service. TV> I reserve judgment on whether their implementation has been fixed in the "me too" TV> meantime; I have no evidence either way at the moment. One of the challenges of anycast is failure detection and mitigation. <mumbles> flooding clusters via source-based routing tunneling anycast-destined OAM packets via unicast ns-to-machine affinity within pods tight coupling of DNS service to anycast route injection </mumbles> Anycast implementation _does_ present new operational challenges, but they're hardly insurmountable. Eddy -- Everquick Internet - http://www.everquick.net/ A division of Brotsman & Dreger, Inc. - http://www.brotsman.com/ Bandwidth, consulting, e-commerce, hosting, and network building Phone: +1 785 865 5885 Lawrence and [inter]national Phone: +1 316 794 8922 Wichita ________________________________________________________________________ DO NOT send mail to the following addresses: email@example.com -*- firstname.lastname@example.org -*- email@example.com Sending mail to spambait addresses is a great way to get blocked. Ditto for broken OOO autoresponders and foolish AV software backscatter.