How do people do their own RDNS without a full class C ?
Kyle R. Green
kyle at kgreen.org
Wed Jan 9 03:33:26 UTC 2002
Let's say you have some addresses in 192.168.0.0/24. In their
0.168.192.in-addr.arpa zone, have them put the following:
5 IN CNAME 192-168-0-5.yourdomain.com
6 IN CNAME 192-168-0-6.yourdomain.com
7 IN CNAME 192-168-0-7.yourdomain.com
And in your yourdomain.com zone:
192-168-0-5 IN PTR www.yourdomain.com
192-168-0-6 IN PTR ftp.yourdomain.com
192-168-0-7 IN PTR mail.yourdomain.com
I've seen this in use in a few colo situations, and it generally works
very well, but they might not want to put CNAMEs in their reverse zones.
Additionally, I'm not 100% sure that this is "proper" DNS.
On Tuesday, January 8, 2002, at 10:19 PM, Patrick Thomas wrote:
>
>
> I have a rack of computers collocated at a datacenter. I do perform my
> own DNS on my own DNS server, BUT, I do not have an entire class C of
> addresses - I only have 64 addresses.
>
> Therefore, my collocation provider says that I cannot do my own reverse
> DNS. I cn do my own forward DNS, of course (which I already am) but
> since
> multiple people are using the class C block, the RDSN requests need to
> go
> to the collocation providers name servers.
>
> ---
>
> THe problem is this: I make frequent and manifold changes to my DNS,
> and
> it will be a major pain for both sides (me and my provider) to have to
> keep communicating changes for their DNS. We would all be a lot happier
> if I could administer my own RDNS. But it is too late - they have
> already assigned the other parts of the class C block to other
> customers,
> so we are sort of locked in.
>
> The questions:
>
> 1. Are we missing something ? Is there some very elegant and easy
> solution that ISPs generally employ for solving a problem like this, or
> does every ISP customer with less than a class C have to rely on someone
> else for RDNS resolution ?
>
> 2. Let's say there is no way around this, and that they really do have
> to
> do RDNS for me - we thought that maybe I could maintain correct RDNS
> entries in my name servers and that the ISP could just do a zone
> transfer
> from my name servers - a zone transfer of only the RDNS records, and
> thus
> get accurate information in an automated fashion from name server that
> _I_
> control. The problem is, my ISP thinks that the only way they could do
> this is by wiping out their entire zone with my entire zone - apparently
> there is no way to simply append my RDNS info to their own using a zone
> transfer. Is this true ?
>
> They suggested maybe I set up some files to be appended and we do a
> `scp`
> copy using cron to append the info to their name servers. This is a
> good
> idea, but it seems like a hack.
>
> Any other ways out of this conundrum ?
>
> Help and suggestions appreciated. Thanks!
>
>
--
Kyle R. Green
kyle at kgreen.org
Delores breezed along the surface of her life like a flat stone forever
skipping along smooth water, rippling reality sporadically but oblivious
to it consistently, until she finally lost momentum, sank, and due to an
overdose of flouride as a child which caused her to suffer from chronic
apathy, doomed herself to lie forever on the floor of her life as
useless as an appendix and as lonely as a five-hundred pound barbell in
a steroid-free fitness center.
-- Winning sentence, 1990 Bulwer-Lytton bad fiction contest.
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