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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!nntp.coast.net!howland.reston.ans.net!Germany.EU.net!Dortmund.Germany.EU.net!interface-business.de!usenet From: j@ida.interface-business.de (J Wunsch) Newsgroups: comp.unix.bsd.bsdi.misc Subject: Re: named help... Date: 14 Jun 1996 08:54:33 GMT Organization: interface business GmbH, Dresden Lines: 25 Message-ID: <4pr9c9$73r@innocence.interface-business.de> References: <4pnmi5$3a7@agate.nbnet.nb.ca> Reply-To: joerg_wunsch@interface-business.de (Joerg Wunsch) NNTP-Posting-Host: ida.interface-business.de X-Newsreader: knews 0.9.6 X-Phone: +49-351-31809-14 X-Fax: +49-351-3361187 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E cavenerl@nbnet.nb.ca (Lance Cavener) wrote: > Just wondering.. I set up my DNS daemon with all the aliases for my > system, and I added the IP addresses for my secondary servers > (config_dns) so everything should work.. Anyway, how do the secondary > servers (and every other DNS server in this world) know that I created > thoes aliases? The secondaries pick it up based on the increasing serial number in the SOA record. (That's why you should not forget to bump it.) They regularly query the SOA of the primary, and pull the entire zone file once it has been increased. All other servers query back at the authoritative server (either primary or secondaries) once the time to live has expired. Thus, the default TTL in the SOA (or the actual TTL in each record) determines the average DNS propagation latency. If you make it low, latency for new changes will be short, but your authoritative servers get much more DNS traffic since all the caching servers in the world are forced to discard the entry quickly. -- J"org Wunsch Unix support engineer joerg_wunsch@interface-business.de http://www.interface-business.de/~j