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Date: Mon, 3 Dec 2001 00:26:18 +0100 (CET)
From: Walter Hop <walter@binity.com>
To: Jim Freeze <jim@freeze.org>
Cc: Anthony Kim <niceshorts@yahoo.com>, <questions@freebsd.org>
Subject: Re: Having trouble with Envelope sender verification
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[in reply to Jim Freeze <jim@freeze.org>, 02/12/01]

> freebsdportal.com.             IN  A  24.9.218.175
> www.freebsdportal.com.         IN  CNAME freebsdportal.com.
> mail.freebsdportal.com.        IN  A  24.9.218.175

Yes, this is a better idea. (an MX should never point to a CNAME)

> > Looking at your reverse lookup zone, I find:
> > 218.9.24.in-addr.arpa.  1D IN NS        ns1.home.net.
>
> Can't I control this if I run my own name server?

Reverse DNS is a hierarchy like DNS (you only have to reverse the IP
address and append "in-addr.arpa." to it). When a name for your
IP-address is looked up, it queries for: (1.) arpa. (2.) in-addr.arpa.
(3.) 24.in-addr.arpa. (4.)  9.24.in-addr.arpa.

The zone "9.24.in-addr.arpa." is handled by ns1/ns2.home.net, they are
the ones responsible for your IP address. The search ends here, even if
you run your own DNS it would never be queried for this reverse lookup
(unless @Home would delegate it to you, which will never happen..)

-- 
 Walter Hop <walter@binity.com>
 Updated contact information: http://www.binity.com/~walter/


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