Date: Wed, 04 Apr 2001 13:42:08 +0200 From: Len Conrad <LConrad@Go2France.com> To: freebsd-questions@freebsd.org Subject: Re: DNS primary secondary question Message-ID: <5.0.0.25.0.20010404133738.034715e0@mail.Go2France.com> In-Reply-To: <Pine.A41.4.10.10104041432250.9122-100000@bessel.tekniikka. turkuamk.fi>
next in thread | previous in thread | raw e-mail | index | archive | help
>I wonder how does resolvers lookup dns names. >Do they check primary and secondary randomly or they check secondary only >if they can't reach the primary server? or does it work so the fastest one >which answer is chosen? Anybody has an idea? To resolvers, all NS for a zone are equivalent for queries. Specifically, there is no master/slave, primary/secondary distinction. A DNS can return its list of NS records for a zone in varying order to share the load among the NS's. The resolvers generally query the NS's in physical order received. In DNS's themselves, their resolvers do look at the speed of responses and favor the fastest one. I don't think non-DNS resolvers are smart enough in general to do that. Len http://MenAndMice.com/DNS-training : In Austin, TX; SFO, CA; Paris, FR http://BIND8NT.MEIway.com : ISC BIND 8.2.3 "NT3" for NT4 & W2K http://IMGate.MEIway.com : Build free, hi-perf, anti-abuse mail gateways To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?5.0.0.25.0.20010404133738.034715e0>