bn TLD DNSSEC Outage: 2021-07-17 to 2021-07-21

Date: July 21, 2021

Overview

This page gives some details on the bn (Brunei) TLD DNSSEC outage from July 17 to July 21, 2021.

Verisign's DNSSEC Debugger

Verisign doesn't archive test results, unlike DNSViz. So here's a screenshot I took on July 20, 2021:

bn dnssec outage

Timeline / DNSViz

Here's a screenshot example:

Brunei 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 bn. @8.8.8.8.

; <<>> dig 9.10.8-P1 <<>> +dnssec ns bn. @8.8.8.8.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 23639
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

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

;; Query time: 93 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Mon Jul 19 00:04:29 UTC 2021
;; MSG SIZE rcvd: 31

You have to disable DNSSEC to make DNS work:

$ dig +cd ns bn. @8.8.8.8.

; <<>> dig 9.10.8-P1 <<>> +cd ns bn. @8.8.8.8.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58424
;; flags: qr rd ra cd; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1

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

;; ANSWER SECTION:
bn. 3599 IN NS NS1.BNNIC.bn.
bn. 3599 IN NS BN-NS.ANYCAST.PCH.NET.
bn. 3599 IN NS NS4.APNIC.NET.
bn. 3599 IN NS NS2.BNNIC.bn.

;; Query time: 30 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Mon Jul 19 00:04:29 UTC 2021
;; MSG SIZE rcvd: 132

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):

[T] bn. 86400 IN DS 26224 8 2 eab03d1aa2537fc2222def6383be358b88d50520f530d1f1cc4f40f1d83e4109
bn. 86400 IN DS 9994 8 2 f4cce04af960518cdd2773ea47dc0bb43ee99a3d55a1a468f46d433afe6a6b9c
;; Domain: bn.
;; Signature ok but no chain to a trusted key or ds record
[S] bn. 3600 IN DNSKEY 256 3 8 ;{id = 30096 (zsk), size = 2048b}
bn. 3600 IN DNSKEY 257 3 8 ;{id = 26224 (ksk), size = 2048b}
bn. 3600 IN DNSKEY 257 3 8 ;{id = 9994 (ksk), size = 2048b}
[S] Existence denied: bn. A
;;[S] self sig OK; [B] bogus; [T] trusted

Logfile examples