.mg TLD DNSSEC Outage: 2017-07-25

Updated: July 25, 2017

Overview

This page gives some details on the .mg (Madagascar) TLD DNSSEC outage on July 25, 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 July 25, 2017:

July 25, 2017 .mg TLD DNSSEC outage

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: mg.
[B] MG. 3600 IN DNSKEY 257 3 5 ;{id = 64652 (ksk), size = 2048b}
MG. 3600 IN DNSKEY 256 3 5 ;{id = 44863 (zsk), size = 1024b}
[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 & DNS-OARC

OpenDNS does not support DNSSEC, while DNS-OARC unfortunately does, and thus, DNS-OARC's users saw SERVFAIL for queries under mg during this outage.

With OpenDNS, without DNSSEC, queries succeed:

$ dig ns mg. @resolver1.opendns.com.

; <<>> DiG 9.4.2-P2 <<>> ns mg. @resolver1.opendns.com.
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49410
;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;mg. IN NS

;; ANSWER SECTION:
mg. 172800 IN NS a.mg.dyntld.net.
mg. 172800 IN NS b.mg.dyntld.net.
mg. 172800 IN NS ns.dts.mg.
mg. 172800 IN NS ns.nic.mg.
mg. 172800 IN NS ns-mg.malagasy.com.
mg. 172800 IN NS censvrns0001.ird.fr.

;; Query time: 0 msec
;; SERVER: 208.67.222.222#53(208.67.222.222)
;; WHEN: Tue Jul 25 18:58:44 2017
;; MSG SIZE rcvd: 172

With DNS-OARC, because of DNSSEC, queries fail:

$ dig +dnssec ns mg. @184.105.193.73

; <<>> DiG 9.4.2-P2 <<>> +dnssec ns mg. @184.105.193.73
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 49182
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 4096
;; QUESTION SECTION:
;mg. IN NS

;; Query time: 494 msec
;; SERVER: 184.105.193.73#53(184.105.193.73)
;; WHEN: Tue Jul 25 18:58:45 2017
;; MSG SIZE rcvd: 31

Logfile examples