[dns-operations] Charter/Spectrum resolver trouble

[Seth Mattinen]

Is there someone from Charter/Spectrum who is responsible for resolvers 
71.10.216.1 and 71.10.216.2 on here? I have a customer that's getting 
SERVFAIL responses from those DNS servers for zones they host. All the 
usual public DNS and other provider's DNS servers are fine.

Examples testing from a Charter residential (coax) connection:


; <<>> DiG 9.11.5-P4-5.1+deb10u3-Debian <<>> A sprux.com @71.10.216.2
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 45159
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 8192
;; QUESTION SECTION:
;sprux.com.                     IN      A

;; Query time: 2564 msec
;; SERVER: 71.10.216.2#53(71.10.216.2)
;; WHEN: Thu Apr 08 10:05:13 PDT 2021
;; MSG SIZE  rcvd: 38


; <<>> DiG 9.11.5-P4-5.1+deb10u3-Debian <<>> A sprux.com @209.18.47.61
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 14541
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 8192
;; QUESTION SECTION:
;sprux.com.                     IN      A

;; ANSWER SECTION:
sprux.com.              1800    IN      A       74.118.157.133

;; Query time: 124 msec
;; SERVER: 209.18.47.61#53(209.18.47.61)
;; WHEN: Thu Apr 08 10:05:39 PDT 2021
;; MSG SIZE  rcvd: 54


; <<>> DiG 9.11.5-P4-5.1+deb10u3-Debian <<>> A sprux.com @9.9.9.9
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34051
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;sprux.com.                     IN      A

;; ANSWER SECTION:
sprux.com.              1800    IN      A       74.118.157.133

;; Query time: 57 msec
;; SERVER: 9.9.9.9#53(9.9.9.9)
;; WHEN: Thu Apr 08 10:05:27 PDT 2021
;; MSG SIZE  rcvd: 54


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