nanog mailing list archives
Re: Anyone from AT&T DNS?
From: Matt Peterman <mpeterman () apple com>
Date: Wed, 04 Oct 2017 23:03:38 -0400
The correct format is as shown below (this is from another /25 I have from AT&T that has DNS setup correctly) $ dig +short CNAME 1.120.232.108.in-addr.arpa 1.0.120.232.108.in-addr.arpa. So for the block I am having an issue with the CNAME records should be For 107.207.168.128 should be 128.128.168.207.107.in-addr.arpa (it shouldn't have “/25” in the middle of it - you can’t even have “/“ in a DNS entry AFAIK) If I do another address from my block I get $ dig +short CNAME 191.168.207.107.in-addr.arpa 191.128/25.168.207.107.in-addr.arpa. Again that would should be 191.128.168.207.107in-addr.arpa. Somehow AT&T DNS got the “/25” prefix length in all of the DNS entries… Matt
On Oct 4, 2017, at 10:53 PM, Christopher Morrow <morrowc.lists () gmail com> wrote: On Wed, Oct 4, 2017 at 10:43 PM, Matt Peterman <mpeterman () apple com <mailto:mpeterman () apple com>> wrote: The PTR record CNAMEs for my /25 allocated prefix are all messed up. They are returning as $ dig +short CNAME 128.168.207.107.in-addr.arpa 128.128/25.168.207.107.in-addr.arpa. Which is obviously a completely invalid DNS entry. I have opened a ticket through the web portal for “prov-dns” but Haven’t gotten a response for 7 days. If anyone from AT&T DNS or knows anyone from AT&T DNS that can help it would be appreciated! isn't this one of the proper forms of reverse delegation in CIDR land? like: http://support.simpledns.com/kb/a146/how-to-sub-delegate-a-reverse-zone.aspx <http://support.simpledns.com/kb/a146/how-to-sub-delegate-a-reverse-zone.aspx> describes, or in a (perhaps more wordy fashion) in RFC2317? http://tools.ietf.org/html/rfc2317 <http://tools.ietf.org/html/rfc2317> I think it may be the case that the NS hosts are not prepared for such a domain/record mapping though... the nameservers that would need to to be authoritative for a zone like: 128/25.168.207.107.in-addr.arpa. and have a bunch of PTR records like: 128 IN PTR foo.you.com <http://foo.you.com/>. 129 IN PTR bar.you.com <http://bar.you.com/>. etc...
Current thread:
- Anyone from AT&T DNS? Matt Peterman (Oct 04)
- Re: Anyone from AT&T DNS? Christopher Morrow (Oct 04)
- Re: Anyone from AT&T DNS? Matt Peterman (Oct 04)
- Re: Anyone from AT&T DNS? Christopher Morrow (Oct 04)
- Re: Anyone from AT&T DNS? Matt Peterman (Oct 04)
- Re: Anyone from AT&T DNS? Christopher Morrow (Oct 04)
- Re: Anyone from AT&T DNS? Matt Peterman (Oct 04)
- Re: Anyone from AT&T DNS? Christopher Morrow (Oct 04)
- Re: Anyone from AT&T DNS? Matt Peterman (Oct 04)
- Re: Anyone from AT&T DNS? Jay Farrell via NANOG (Oct 05)
- Re: Anyone from AT&T DNS? Mark Andrews (Oct 08)
- Re: Anyone from AT&T DNS? Matt Peterman (Oct 04)
- Re: Anyone from AT&T DNS? Christopher Morrow (Oct 04)
- Re: Anyone from AT&T DNS? Mark Andrews (Oct 08)