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Re: making workbook.com point to www.workbook.com

From: Men & Mice Support
Date: Tuesday, May 8, 2001
Time: 9:46:42 pm

At 2:50 PM -0700 5/8/01, Stephen Chiang wrote:
>Here's my situation:
>
>I've got two Webstar servers being load balanced by QDNS using the load
>balancing plug-in.
>
>So in my QDNS table, I have the record:
>
>www.workbook.com load hosts:2
>
>I don't have any A records for www.workbook.com. Everything works okay this
>way...
>
>Now, when I add the following:
>
>workbook.com load hosts:2 (same servers as above)
>
>my QDNS server stops responding to queries... is this a bug or
>misconfiguration?

It's a limitation of our implementation of load balancing. A load
balance record can't have the same name as any other record;
consequently, it can't have the same name as a zone (a domain file in
the old terminology). The same limitations apply to CNAME records.

Thus, there is no way in QuickDNS (any version) to load balance the
name of a zone.

>and take out the above and add the following instead:
>
>workbook.com CNAME www.workbook.com
>
>this just flat out doesn't work. Should work right? It does on Windows DNS
>(with only one www server).

No, it doesn't work. That's an illegal CNAME record. QuickDNS Server
for Mac OS 8/9 properly rejects that when loading the zone. If
Windows DNS (MS DNS) accepts it, that will cause other random
problems with the rest of your zone.

In BIND and those servers derived from BIND, if you try this, the
entire zone will be considered broken by the server, which will have
serious consequences.

>What I am wondering is if I am making configuration mistakes or what because
>both of the above seem like logical entries into the name table.

It seems logical until you understand that:

- a CNAME record is more than simply a way to associate one name with
another name's IP address, and
- a load balance record is a delegated subdomain (or subzone). It
doesn't look like that, but that's how it's implemented underneath.
____________________________________________________________________
Chris Buxton Men & Mice
cbuxton@menandmice.com We Make DNS Easy!



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