.lidl TLD DNSSEC Outage: 2017-12-07

Date: December 7, 2017

Overview

This page gives some details on the lidl TLD DNSSEC outage on December 7, 2017.

Timeline / DNSViz

DNS-OARC: 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 ns lidl. @184.105.193.73

; <<>> DiG 9.10.3-P4-Debian <<>> +dnssec ns lidl. @184.105.193.73
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 19161
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

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

;; Query time: 1160 msec
;; SERVER: 184.105.193.73#53(184.105.193.73)
;; WHEN: Thu Dec 07 17:23:06 UTC 2017
;; MSG SIZE rcvd: 33

You have to disable DNSSEC to make DNS queries work:

$ dig +cd ns lidl. @184.105.193.74

; <<>> DiG 9.10.3-P4-Debian <<>> +cd ns lidl. @184.105.193.74
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 22732
;; flags: qr rd ra cd; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 1

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

;; ANSWER SECTION:
lidl. 43200 IN NS d.nic.lidl.
lidl. 43200 IN NS c.nic.lidl.
lidl. 43200 IN NS b.nic.lidl.
lidl. 43200 IN NS ns2b.ksregistry.com.
lidl. 43200 IN NS ns1b.ksregistry.net.
lidl. 43200 IN NS ns2a.ksregistry.com.
lidl. 43200 IN NS a.nic.lidl.
lidl. 43200 IN NS ns1a.ksregistry.net.

;; Query time: 500 msec
;; SERVER: 184.105.193.74#53(184.105.193.74)
;; WHEN: Thu Dec 07 17:23:09 UTC 2017
;; MSG SIZE rcvd: 205

Logfile examples