It’s being filtered. Only Charter can tell you why. 

-- 
Mark Andrews

On 26 Oct 2023, at 05:07, Jason J. Gullickson via NANOG <nanog@nanog.org> wrote:



I've been working for a week or so to solve a problem with DNS resolution for Charter customers for our domain bonesinjars.com.  I've reached-out to Charter directly but since I'm not a customer I couldn't get any help from them.  I was directed by a friend to this list in hopes that there may be able to reach a Charter/Spectrum engineer who might be able to explain and/or resolve this one.

A dig against Google's DNS servers correctly returns 4 A records:


dig bonesinjars.com 8.8.8.8

; <<>> DiG 9.18.12-0ubuntu0.22.04.3-Ubuntu <<>> bonesinjars.com 8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31383
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;bonesinjars.com.               IN      A

;; ANSWER SECTION:
bonesinjars.com.        60      IN      A       198.49.23.145
bonesinjars.com.        60      IN      A       198.185.159.145
bonesinjars.com.        60      IN      A       198.49.23.144
bonesinjars.com.        60      IN      A       198.185.159.144

;; Query time: 1039 msec
;; SERVER: 127.0.0.53#53(127.0.0.53) (UDP)
;; WHEN: Mon Oct 23 10:26:32 CDT 2023
;; MSG SIZE  rcvd: 108

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 26879
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;8.8.8.8.                       IN      A

;; Query time: 35 msec
;; SERVER: 127.0.0.53#53(127.0.0.53) (UDP)
;; WHEN: Mon Oct 23 10:26:32 CDT 2023
;; MSG SIZE  rcvd: 36


Verizon, AT&T, Comcast and all other DNS servers we tested return the same 4 A records.  However the same dig against a Charter DNS (24.196.64.53) returns only 127.0.0.54:


dig bonesinjars.com 24.196.64.53

; <<>> DiG 9.16.1-Ubuntu <<>> bonesinjars.com 24.196.64.53
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17691
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;bonesinjars.com.        IN    A

;; ANSWER SECTION:
bonesinjars.com.    60    IN    A    127.0.0.54

;; Query time: 55 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Tue Oct 24 13:28:36 CDT 2023
;; MSG SIZE  rcvd: 60

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4658
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;24.196.64.53.            IN    A

;; ANSWER SECTION:
24.196.64.53.        86400    IN    A    24.196.64.53

;; Query time: 27 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Tue Oct 24 13:28:36 CDT 2023
;; MSG SIZE  rcvd: 57


Any help understanding and addressing this is greatly appreciated!


Jason