From mboxrd@z Thu Jan  1 00:00:00 1970
From: erik quanstrom <quanstro@labs.coraid.com>
Date: Tue, 13 Apr 2010 13:25:45 -0400
To: 9fans@9fans.net
Message-ID: <3d6e7e6c9ddaaf20ea2bd46fa9f87352@coraid.com>
In-Reply-To: <621112A569DAE948AD25CCDCF1C07533299919@dolly.ntdom.cupdx>
References: <621112A569DAE948AD25CCDCF1C07533299919@dolly.ntdom.cupdx>
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Subject: Re: [9fans] DNS... don't ask
Topicbox-Message-UUID: 00e95abe-ead6-11e9-9d60-3106f5b1d025

> A post on this list by Geoff says that if you specify an in-addr.arpa zone,
> the correct PTR's will get generated automatically.  How does it know which
> PTR to generate, if I have more than one dom= pointing to the same ip?

it makes all of them. e.g.

> 7.0/27.113.51.12.in-addr.arpa any
7.0/27.113.51.12.in-addr.arpa ptr	imap.coraid.com
7.0/27.113.51.12.in-addr.arpa ptr	smtp.coraid.com

there's a bug in dns that prevents this query from working
alone.  you'll have to do this query first:

> 7.113.51.12.in-addr.arpa any
2.113.51.12.in-addr.arpa cname	7.0/27.113.51.12.in-addr.arpa

- erik