mg TLD DNSSEC Outage: 2017-05-30

Date: May 30, 2017

Overview

This page gives some details on the mg (Madagascar) TLD DNSSEC outage on May 30, 2017.

Timeline / DNSViz

Zonemaster

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):

[T] mg. 86400 IN DS 64652 5 2 f55dcb5946c539f71b13fa83491864f672fc65589b313fc99dd65e4f14f8a8b3
;; Domain: mg.
[B] mg. 3600 IN DNSKEY 256 3 5 ;{id = 33060 (zsk), size = 1024b}
mg. 3600 IN DNSKEY 257 3 5 ;{id = 64652 (ksk), size = 2048b}
[B] Error verifying denial of existence for mg. type A: No keys with the keytag and algorithm from the RRSIG found
;;[S] self sig OK; [B] bogus; [T] trusted

OpenDNS vs. Google Public DNS

OpenDNS does not support DNSSEC, and instead supports DNSCurve. Google Public DNS currently supports only DNSSEC, and thus, Google's users saw SERVFAIL for queries under mg during this outage.

With OpenDNS, without DNSSEC, queries succeed:

; <<>> DiG 9.4.2-P2 <<>> mg. @resolver1.opendns.com.
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26144
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
mg. IN A

;; AUTHORITY SECTION:
mg. 3600 IN SOA ns.nic.mg. ramboa.nic.mg. 2017053023 21600 3600 604800 3600

;; Query time: 90 msec
;; SERVER: 208.67.222.222#53(208.67.222.222)
;; WHEN: Tue May 30 23:03:03 2017
;; MSG SIZE rcvd: 78

With Google Public DNS, because of DNSSEC, queries fail:

; <<>> DiG 9.4.2-P2 <<>> +dnssec mg. @8.8.8.8
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 48201
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

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

;; Query time: 49 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue May 30 23:03:03 2017
;; MSG SIZE rcvd: 31

Logfile examples