getdnsapi.net DNSSEC Outage:
2017-09-16 to 2017-09-18

Updated: September 18, 2017

Overview

This page gives some details on the getdnsapi.net DNSSEC outage from September 16 to September 18, 2017.

Timeline / DNSViz

DNSSEC Debugger

Unlike DNSViz, Verisign's DNSSEC Debugger doesn't archive results, so here's a screenshot of my web browser's output from September 16, 2017:

September 16, 2017 getdnsapi.net DNSSEC outage

dns-operations mailing list

This DNSSEC outage was discussed on the dns-operations list in [dns-operations] DNSSEC signatures expired for getdnsapi.org and getdnsapi.net.

drill trace

Since DNSSEC contains so much garbage, I put the complete drill trace into its own file, with the relevant portion below (emphasis added):

;; Domain: getdnsapi.net.
[B] getdnsapi.net. 3600 IN DNSKEY 257 3 7 ;{id = 8850 (ksk), size = 2048b}
getdnsapi.net. 3600 IN DNSKEY 256 3 7 ;{id = 32852 (zsk), size = 1024b}
[B] getdnsapi.net. 450 IN A 185.49.141.37
;; Error: No keys with the keytag and algorithm from the RRSIG found
;;[S] self sig OK; [B] bogus; [T] trusted

Google Public DNS: with and without DNSSEC

DNSSEC can be disabled in queries via the CD (checking disabled) bit. Let's compare DNS queries with and without DNSSEC.

With DNSSEC, DNS queries fail:

$ dig +dnssec a getdnsapi.net. @8.8.8.8

; <<>> DiG 9.4.2-P2 <<>> +dnssec a getdnsapi.net. @8.8.8.8
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 44128
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 512
;; QUESTION SECTION:
;getdnsapi.net. IN A

;; Query time: 433 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sat Sep 16 19:18:59 2017
;; MSG SIZE rcvd: 42

You have to disable DNSSEC to make DNS queries work:

$ dig +cd a getdnsapi.net. @8.8.8.8

; <<>> DiG 9.4.2-P2 <<>> +cd a getdnsapi.net. @8.8.8.8
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49109
;; flags: qr rd ra cd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;getdnsapi.net. IN A

;; ANSWER SECTION:
getdnsapi.net. 449 IN A 185.49.141.37

;; Query time: 74 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sat Sep 16 19:18:59 2017
;; MSG SIZE rcvd: 47

Logfile examples