Mail Server (DNS) Migration

Brad Knowles brad.knowles at skynet.be
Mon Apr 23 00:24:44 UTC 2001


At 10:04 PM -0400 4/20/01, Kevin Darcy wrote:

>  You could try replacing that CNAME with 2 A records, one for each address.
>  If the clients are smart enough, they'll fail over automatically after a
>  short delay. This delay may even be configurable.

	Problem is, PC clients *aren't* smart enough to do that -- they 
only ever use the first IP address they are told about, and never 
fail over to the second.

	This is why you need load-balancing switches and/or 
application-layer proxies to hide that kind complexity and make it 
appear that there is only ever one machine that they're talking to.

-- 
Brad Knowles, <brad.knowles at skynet.be>

/*        efdtt.c  Author:  Charles M. Hannum <root at ihack.net>          */
/*       Represented as 1045 digit prime number by Phil Carmody         */
/*     Prime as DNS cname chain by Roy Arends and Walter Belgers        */
/*                                                                      */
/*     Usage is:  cat title-key scrambled.vob | efdtt >clear.vob        */
/*   where title-key = "153 2 8 105 225" or other similar 5-byte key    */

dig decss.friet.org|perl -ne'if(/^x/){s/[x.]//g;print pack(H124,$_)}'


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