Ubuntu
systemd package

  1. Bug #2024320
  2. Comment #0

Comment 0 for bug 2024320

Revision history for this message
psl (slansky) wrote : systemd-resolv: returns SERVFAIL for uknown domain

Ubuntu 22.04.2 amd64
systemd: 249.11-0ubuntu3.9

when I ask for non-existing domain, systemd-resolve replies with SERVFAIL. I believe that correct answer should be NXDOMAIN.

DEMO, I use `khost` utility from package `knot-host`:

CloudFlare DNS, reference, I believe this is expected answer:

$ khost oops. 1.1.1.1
Host oops. type A error: NXDOMAIN
Host oops. type AAAA error: NXDOMAIN
Host oops. type MX error: NXDOMAIN

systemd-resolv, the bug (and the reply is not consistent, MX record has different error):

$ khost oops.
Host oops. type A error: SERVFAIL
Host oops. type AAAA error: SERVFAIL
Host oops. type MX error: NXDOMAIN

$ khost -v oops.
;; ->>HEADER<<- opcode: QUERY; status: SERVFAIL; id: 15468
;; Flags: qr aa rd ra; QUERY: 1; ANSWER: 0; AUTHORITY: 0; ADDITIONAL: 0
;;oops. IN A

;; Received 22 B
;; Time 2023-06-18 18:27:02 UTC
;; From 127.0.0.53@53(UDP) in 0.0 ms

;; ->>HEADER<<- opcode: QUERY; status: SERVFAIL; id: 55107
;; Flags: qr aa rd ra; QUERY: 1; ANSWER: 0; AUTHORITY: 0; ADDITIONAL: 0
;;oops. IN AAAA

;; Received 22 B
;; Time 2023-06-18 18:27:02 UTC
;; From 127.0.0.53@53(UDP) in 0.0 ms

;; ->>HEADER<<- opcode: QUERY; status: NXDOMAIN; id: 46585
;; Flags: qr rd ra; QUERY: 1; ANSWER: 0; AUTHORITY: 1; ADDITIONAL: 0
;;oops. IN MX
. 1390 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2023061800 1800 900 604800 86400

;; Received 97 B
;; Time 2023-06-18 18:27:02 UTC
;; From 127.0.0.53@53(UDP) in 3.4 ms