[65748] in North American Network Operators' Group
Re: AOL rejecting mail from IP's w/o reverse DNS ?
daemon@ATHENA.MIT.EDU (Adam Kujawski)
Sat Dec 6 21:53:50 2003
Date: Sat, 6 Dec 2003 21:53:15 -0500
From: Adam Kujawski <adamkuj@amplex.net>
To: nanog@nanog.org
In-Reply-To: <20031205010800.GB4541@flounder.net>
Errors-To: owner-nanog-outgoing@merit.edu
Quoting Adam McKenna <adam@flounder.net>:
> On Thu, Dec 04, 2003 at 04:59:59PM -0800, Crist Clark wrote:
> > $ORIGIN 168.50.204.in-addr.arpa.
> > $GENERATE 0-15 $ NS a.ns.$
> > $GENERATE 0-15 a.ns.$ A 204.50.168.2
> >
> > Is any harder than,
> >
> > $ORIGIN 168.50.204.in-addr.arpa.
> > $GENERATE 0-15 CNAME $.0/28
> > 0/28 NS ns.mydomain.org.
>
> That's the whole point. They are equivalent, but the former doesn't force
> you to invent your own naming scheme or use CNAMES (if using A records in
> in-addr.arpa domains is distasteful, then imho using CNAMES is even more
> distasteful, not to mention RR's containing the "/" character).
>
> --Adam
Why bother with CNAMES or A records? Is there anything wrong with simply using
NS records for each adress? i.e.:
$ORIGIN 109.246.64.in-addr.arpa.
1 NS ns1.customerA.com.
1 NS ns2.customerA.com.
2 NS ns1.customerA.com.
2 NS ns2.customerA.com.
...
16 NS ns1.customerB.com.
16 NS ns2.customerB.com.
17 NS ns1.customerB.com.
17 NS ns2.customerB.com.
If the customer has a dozen name servers they want you to allocate reverse DNS
for, it could become unwieldy, but technically, is there anything wrong with
this setup?
-Adam
