Date: Sat, 15 Sep 2001 09:12:04 -0500 From: Len Conrad <LConrad@Go2France.com> To: Freebsd-questions@freebsd.org Subject: Re: Mail Server - Round Robin Load Distribution Message-ID: <5.1.0.14.0.20010915085600.03274008@mail.Go2France.com> In-Reply-To: <3BA35C8B.8ACC74E6@buckhorn.net> References: <20010915080113.985.qmail@web20101.mail.yahoo.com> <20010915222844.A6415@plug.cx>
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>Multiple A records for a single MX, as well as CNAMES for the MX record >won't do what you want, as clients and servers (DNS) tend to cache >addresses. BIND caches, of course. The only other non-recursive resolver that Iīve heard of is in W2K, MS anticipating that in their primary target market of AD + DHCP + DDNS intranets that they needed to reduce query loads. What are the others? >Since your DNS server will always pass along the first A >record false. eg, with BIND, the default RRset-order value is cyclic. do dig aol.com mx 10 times to confirm. >, or the first CNAME, no balancing will occure. false. BINDīs RRset-order cyclic or random will cause effective load distribution among members of the RRset for resolvers that work strictly with the physical order of RRset records. IN conrast, BIND's own recursive resolver uses RTT, round trip time, to determine, continuously and dynamically, which member of the RRset it will query. >The priority flag for the MX record was designed for just this reason. false. the preference field is not for distributing load, but for providing backup MX's. >domain.com. IN MX 10 mail1 >domain.com. IN MX 10 mail2 >mail1 IN A 1.2.3.4 >mail2 IN A 1.2.3.5 ok, your answer is right, for the wrong reasons. :)) Len http://MenAndMice.com/DNS-training http://BIND8NT.MEIway.com : ISC BIND 8.2.4 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
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