Anyone from AT&T DNS?

Mark Andrews marka at isc.org
Mon Oct 9 01:09:15 CST 2017


In message <50298399-672D-4BA1-A726-7128B84B89FF at apple.com>, Matt Peterman writes:
> Got it! You’re the winner here. I just setup both of my zones the name
> way and obviously AT&T changed the way they did RDNS entries from when I
> got a /25 last November and this second /25 in June. Oh well!
>
> Now I am running into the challenge of Route53 does seem to support
> creating an authoritative zone for "128/25.168.207.107.in-addr.arpa.” It
> changes it to "128\05725.168.207.107.in-addr.arpa.” every time… *sigh* If
> it isn't one thing its something else.

Which is "128925.168.207.107.in-addr.arpa." when fed into a domain
name parser.  DNS escapes sequences are DECIMAL not OCTAL.  I suggest
that you log a bug report.

128/25.168.207.107.in-addr.arpa. == 128\04725.168.207.107.in-addr.arpa

RFC 1035

\DDD            where each D is a digit is the octet corresponding to
                the decimal number described by DDD.  The resulting
                octet is assumed to be text and is not checked for
                special meaning.

That said '/' is not special to DNS parsers and shouldn't need to be
converted to \DDD.

Mark

% dig '128\05725.168.207.107.in-addr.arpa'
;; BADCOOKIE, retrying.

; <<>> DiG 9.12.0a1+hotspot+add-prefetch+marka <<>> 128\05725.168.207.107.in-addr.arpa
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 8078
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: ac2bc18c4e18f907a872f2b559dacb6ab6e64fb72a9c71d5 (good)
;; QUESTION SECTION:
;128925.168.207.107.in-addr.arpa. IN	A

;; AUTHORITY SECTION:
168.207.107.in-addr.arpa. 3600	IN	SOA	ns1.swbell.net. rm-hostmaster.ems.att.com. 2 10800 900 604800 7200

;; Query time: 1244 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon Oct 09 12:05:46 AEDT 2017
;; MSG SIZE  rcvd: 163

% 

% dig '128\04725.168.207.107.in-addr.arpa'
;; BADCOOKIE, retrying.

; <<>> DiG 9.12.0a1+hotspot+add-prefetch+marka <<>> 128\04725.168.207.107.in-addr.arpa
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54452
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: e6bdbbdf26697275cf492e9059dacbecc9eb8186d940bd69 (good)
;; QUESTION SECTION:
;128/25.168.207.107.in-addr.arpa. IN	A

;; AUTHORITY SECTION:
128/25.168.207.107.in-addr.arpa. 900 IN	SOA	ns-1746.awsdns-26.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

;; Query time: 1142 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon Oct 09 12:07:56 AEDT 2017
;; MSG SIZE  rcvd: 175

% 

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org


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