North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Load balancing/Multiple CNAME's (Was: Re: Beyond DNS...)
Daniel Reed wrote: > First of all, I would have a CNAME along with extra information Yes, I clarified that in my previous post, sorry for the confusion. > ) Well I'll take that as a compliment, since I am DALnet's hostmaster. :) > ) However I regret to inform you that I did use the CNAME hack to fine > ) tune our load balancing. > Ah, so that explains why nslookup barfs when I try to lookup irc.dal.net > repeatedly. A) Define "barfs." B) nslookup has peculiarities of its own, dig is a much better tool. C) I never have any problems with it so I'd be curious to know what you mean. :) > ) I'd also like to point out that the IP's in a > ) true round-robin setup (as manifest with BIND, et al) will be returned > ) randomly, not in a rotate once cycle. > Well, if that is true, then it's because of your setup. BIND will rotate > IPs once per query, and that's documented behaviour. Chapter and verse? Rotate yes, rotate left one cycle (I'm 98% sure) no. > For an easier to see example, nslookup nanog.random.ml.org a couple times. I strongly suspect that the behavior you're seeing is due to the small sample set. Try it with 10 IP's or more. Also, I was speaking specifically about how the server answers queries. You have a TTL of 8 hours, after the first answer you're getting resolver cache. > ) Finally, if you plan to disagree with anything in this post, please > ) quote chapter and verse from the relevant RFC. I've spent a lot of time > ) studying this topic and am quite sure of my facts. > I'd rather come up with evidence as opposed to rhetoric, but if you > insist... > > Well, I downloaded bind-8.1.2-doc.tar.gz, but I don't really have the time > currently to look through it to find out specific examples in the > documentation. I'll be here. :) Doug -- *** Chief Operations Officer, DALnet IRC network *** *** Proud designer and maintainer of one of the world's largest *** Internet Relay Chat servers with 5,328 simultaneous connections *** Try spider.dal.net on ports 6662-4 (Powered by FreeBSD)
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