.by (Belarus) TLD DNSSEC Outage: 2018-11-23

Date: November 23, 2018

Overview

This page gives some details on the .by DNSSEC outage on November 23, 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 23, 2018:

November 23, 2018 .by 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 by. @8.8.8.8

; <<>> DiG 9.4.2-P2 <<>> +dnssec ns by. @8.8.8.8
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 26488
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

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

;; Query time: 78 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Fri Nov 23 11:01:19 2018
;; MSG SIZE rcvd: 31

You have to disable DNSSEC to make DNS work:

$ dig +cd ns by. @8.8.8.8

; <<>> DiG 9.4.2-P2 <<>> +cd ns by. @8.8.8.8
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50957
;; flags: qr rd ra cd; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;by. IN NS

;; ANSWER SECTION:
by. 3599 IN NS dns4.tld.tutby.com.
by. 3599 IN NS dns1.tld.tutby.com.
by. 3599 IN NS dns5.tld.tutby.com.
by. 3599 IN NS dns3.tld.tutby.com.
by. 3599 IN NS dns2.tld.tutby.com.

;; Query time: 161 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Fri Nov 23 11:01:19 2018
;; MSG SIZE rcvd: 128

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: by.
;; No DNSKEY record found for by.
[U] No data found for: by. type A
;;[S] self sig OK; [B] bogus; [T] trusted

Logfile examples