Date: Mon, 7 Dec 1998 14:00:10 -0600 (CST) From: Tony Kimball <alk@pobox.com> To: freebsd-net@FreeBSD.ORG Subject: Re: resolver behaviour Message-ID: <13932.13015.210945.112197@avalon.east> References: <199812071421.JAA08541@whizzo.transsys.com> <199812071515.JAA21169@carp.gbr.epa.gov>
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Quoth Mike Jenkins on Mon, 7 December: : If I ask ns1.bozo.com does he know mail.bozo.com and he says NO, : and I ask ns2.bozo.com does he know mail.bozo.com and he says YES, : then who is right? It depends on whether ns2 is providing a working mapping. >From the point of view of the closed world of DNS there is no reason to prefer one answer over another. Applications, however, operate in the larger world of the network as a whole. For an application, a name lookup is just a means to an end: the formation of a connection to mail.bozo.com, in this case. Accepting the response of ns1 when ns2 has a good mapping prevents the application from functioning correctly. The user thus encounters the bug. Accepting the response from ns2 when ns2 has a good mapping avoids the bug. Accepting the response from ns2 when ns2 has a bad mapping does no damage to the user, who again encounters the bug. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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