.llp TLD DNSSEC Outage: 2020-04-03

Date: April 3, 2020

Overview

This page gives some details on the .llp TLD DNSSEC outage on April 3, 2020.

Timeline / DNSViz

There are a couple copies of the DNSViz output from 2020-04-03 17:59:51 UTC, saved at:

DNSSEC Debugger

Here's a screenshot of my web browser's output from April 3, 2020:

April 3, 2020 .llp TLD DNSSEC outage

Google 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.

$ dig +dnssec ns llp. @8.8.8.8

; <<>> DiG 9.4.2-P2 <<>> +dnssec ns llp. @8.8.8.8
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 3649
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

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

;; Query time: 76 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Fri Apr 3 17:50:47 2020
;; MSG SIZE rcvd: 32

You have to disable DNSSEC to make DNS queries work:

$ dig +cd ns llp. @8.8.8.8

; <<>> DiG 9.4.2-P2 <<>> +cd ns llp. @8.8.8.8
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 60152
;; flags: qr rd ra cd; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;llp. IN NS

;; ANSWER SECTION:
llp. 21599 IN NS ns1.uniregistry.net.
llp. 21599 IN NS ns4.uniregistry.info.
llp. 21599 IN NS ns3.uniregistry.net.
llp. 21599 IN NS ns2.uniregistry.info.

;; Query time: 37 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Fri Apr 3 17:50:47 2020
;; MSG SIZE rcvd: 124

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):

llp. 86400 IN DS 27216 7 2 b95649568bd88f57c7500a9e21d1d181065170cadbb881e299fd82e3a9909c23
;; Domain: llp.
[B] llp. 86400 IN DNSKEY 257 3 7 ;{id = 27216 (ksk), size = 1024b}
llp. 86400 IN DNSKEY 256 3 7 ;{id = 53960 (zsk), size = 1024b}
[B] llp. 3600 IN A 127.0.53.53
;; Error: No keys with the keytag and algorithm from the RRSIG found
;;[S] self sig OK; [B] bogus; [T] trusted

Logfile examples

These Unbound log entries come from different Unbound instances, each on different servers in different geographical regions.