.lr (Liberia) TLD DNSSEC Outage: 2018-11-20

Date: November 20, 2018

Overview

This page gives some details on the .lr DNSSEC outage on November 20, 2018.

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 November 20, 2018:

November 20, 2018 .lr DNSSEC outage

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 result in SERVFAIL:

$ dig +dnssec ns lr. @8.8.8.8

; <<>> DiG 9.4.2-P2 <<>> +dnssec ns lr. @8.8.8.8
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 25605
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

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

;; Query time: 333 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue Nov 20 16:58:15 2018
;; MSG SIZE rcvd: 31

$ dig +cd ns lr. @8.8.8.8

; <<>> DiG 9.4.2-P2 <<>> +cd ns lr. @8.8.8.8
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27623
;; flags: qr rd ra cd; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;lr. IN NS

;; ANSWER SECTION:
lr. 14399 IN NS fork.sth.dnsnode.net.
lr. 14399 IN NS ns-lr.afrinic.net.
lr. 14399 IN NS rip.psg.com.

;; Query time: 17 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue Nov 20 16:58:15 2018
;; MSG SIZE rcvd: 107

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: lr.
[B] lr. 3600 IN DNSKEY 256 3 8 ;{id = 29959 (zsk), size = 2048b}
lr. 3600 IN DNSKEY 256 3 8 ;{id = 6711 (zsk), size = 2048b}
lr. 3600 IN DNSKEY 257 3 8 ;{id = 29984 (ksk), size = 2048b}
[B] Error verifying denial of existence for lr. type A: No keys with the keytag and algorithm from the RRSIG found
;;[S] self sig OK; [B] bogus; [T] trusted

Logfile examples