Date: Sun, 23 Mar 2003 11:20:29 -0600 From: Len Conrad <LConrad@Go2France.com> To: freebsd-isp@freebsd.org Subject: Re: Server redundancy over 2 co-locations Message-ID: <5.2.0.9.0.20030323110847.03d78188@mail.go2france.com> In-Reply-To: <5.2.0.9.0.20030323164230.047f5650@mail.monkey-online.net>
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>-The world famous F5 Networks 3-DNS controller; You pay for a lot of fancy >things that I don't need yep >because it can ballance the connection over multiple locations, which I >don't need. nope >-Some sort of round-robin system, that runs on both locations (primary at >location 1 and secondary at location 2) and checks if location 1 is still >up, and otherwise points to location 2. This is pretty easy to do with a dynamic, sandboxed sub-zone for a www.domain.com zone. I helped an on-line travel site set up his Radware Linkproof box and got to learn all about this approach with the Radware people. I have a (commercial) scheme like this for load-balancing and failing over of MX gateways as part of IMGate. >I don't know if I'll get problems with TTL times All DNS load-balancing and/or failover tactics require tiny TTL on the A records. >, DNS caches Your unwanted effects of caching are minimized with the short TTL > etc with the round-robin system, or with the 3-DNS controller. > >What are your thoughts and experiences on this subject? round-robin won't give you primary/secondary failover. It will give you dumb load distribution, so when one ip is down, it will still see traffic (that will time out, not a desirable "user experience") since DNS will still be passing out the RR-set of A records for the www domain name. To do exactly what you want, there used to be a project called "fez" (nothing to do with Arabs, you Super Patriots) on sourceforge but has been gone quite a while. You can find Linkproof boxes on eBay for the typical fraction of $new. Len _____________________________________________________________________ MenAndMice.com/DNS-training: Austin; Chicago; San Jose; Toronto IMGate.MEIway.com: anti-spam gateway, effective on 1000's of sites, free To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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