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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