It's happened to me a few times on 20.04.1:
$ host support.coinjar.com
support.coinjar.com has address 0.0.0.0
support.coinjar.com has IPv6 address ::
support.coinjar.com is an alias for coinjar.zendesk.com.
coinjar.zendesk.com mail is handled by 10 mail-pod-25.int.zendesk.com.
$ sudo resolvectl flush-caches
$ host support.coinjar.com
support.coinjar.com has address 0.0.0.0
support.coinjar.com has IPv6 address ::
support.coinjar.com is an alias for coinjar.zendesk.com.
coinjar.zendesk.com mail is handled by 10 mail-pod-25.int.zendesk.com.
$ dig support.coinjar.com
; <<>> DiG 9.16.1-Ubuntu <<>> support.coinjar.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12759
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;support.coinjar.com. IN A
;; ANSWER SECTION:
support.coinjar.com. 34 IN A 0.0.0.0
;; Query time: 0 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Wed Jan 06 20:23:28 AEDT 2021
;; MSG SIZE rcvd: 64
Then 2 minutes later the problem resolves itself:
$ dig support.coinjar.com
; <<>> DiG 9.16.1-Ubuntu <<>> support.coinjar.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 64605
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;support.coinjar.com. IN A
;; ANSWER SECTION:
support.coinjar.com. 151 IN CNAME coinjar.zendesk.com.
coinjar.zendesk.com. 900 IN A 104.16.51.111
coinjar.zendesk.com. 900 IN A 104.16.53.111
;; Query time: 68 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Wed Jan 06 20:25:31 AEDT 2021
;; MSG SIZE rcvd: 110
Nothing in /var/log/syslog or systemd-resolved's systemd log.
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https://bugs.launchpad.net/bugs/1170353
Title:
Host names intermittently resolve to 0.0.0.0
Status in network-manager package in Ubuntu:
Invalid
Bug description:
About 5% of DNS queries resolve to 0.0.0.0.
A couple of times an hour during normal browsing, Firefox resolves a
domain to 0.0.0.0. Opening the same site in Chrome has a 50% chance of
it working, then it normally works after a few reloads. Thunderbird
has also occasionally resolved googlemail.com to 0.0.0.0. Domains
include google.com, wikipedia.org, harvestapp.com and many more.
I couldn't reproduce this with dig/nslookup for a while, but after 5
minutes of (re)trying random domains) did:
$ dig mail.google.com
; <<>> DiG 9.8.1-P1 <<>> mail.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 22905
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;mail.google.com. IN A
;; ANSWER SECTION:
mail.google.com. 60 IN A 0.0.0.0
;; Query time: 0 msec
;; SERVER: 127.0.1.1#53(127.0.1.1)
;; WHEN: Thu Apr 18 13:57:04 2013
;; MSG SIZE rcvd: 49
Note the "0 msec", so I'm pretty sure this is dnsmasq's local cache.
Using Xubuntu 12.10, NetworkManager 0.9.6.0, Dnsmasq 2.63rc6.
NetworkManager has DNS servers set to "8.8.8.8, 8.8.4.4" (also tried
setting it to my router's DNS server, with no effect).
/etc/resolve.conf just has "nameserver 127.0.1.1"
dnsmasq is currently running:
/usr/sbin/dnsmasq --no-resolv --keep-in-foreground --no-hosts --bind-
interfaces --pid-file=/var/run/sendsigs.omit.d/network-
manager.dnsmasq.pid --listen-address=127.0.1.1 --conf-file=/var/run
/nm-dns-dnsmasq.conf --cache-size=0 --proxy-dnssec --enable-
dbus=org.freedesktop.NetworkManager.dnsmasq --conf-
dir=/etc/NetworkManager/dnsmasq.d
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: network-manager 0.9.6.0-0ubuntu7
ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
Uname: Linux 3.5.0-21-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211
not found.
Date: Thu Apr 18 14:27:33 2013
IfupdownConfig:
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
InstallationDate: Installed on 2013-01-11 (97 days ago)
InstallationMedia: Xubuntu 12.10 "Quantal Quetzal" - Release amd64
(20121017.1)
IpRoute:
default via 10.0.0.1 dev eth0 proto static
10.0.0.0/24 dev eth0 proto kernel scope link src 10.0.0.10 metric 1
169.254.0.0/16 dev eth0 scope link metric 1000
IwConfig:
eth0 no wireless extensions.
lo no wireless extensions.
MarkForUpload: True
NetworkManager.state:
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
RfKill:
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog:
Apr 18 09:48:24 base100 kernel: [ 3679.586853] xhci_hcd 0000:00:14.0: WARN
Event TRB for slot 1 ep 0 with no TDs queued?
Apr 18 10:09:03 base100 kernel: [ 4916.445925] xhci_queue_intr_tx: 39
callbacks suppressed
Apr 18 10:09:06 base100 kernel: [ 4919.096387] xhci_hcd 0000:00:14.0: WARN
Event TRB for slot 1 ep 0 with no TDs queued?
Apr 18 13:50:09 base100 kernel: [18155.501321] xhci_hcd 0000:00:14.0: WARN
Event TRB for slot 1 ep 0 with no TDs queued?
mtime.conffile..etc.NetworkManager.NetworkManager.conf:
2013-01-11T14:15:17.434186
nmcli-con:
NAME UUID TYPE
TIMESTAMP TIMESTAMP-REAL AUTOCONNECT READONLY
DBUS-PATH
YB SmarTrack 71694158-7304-4ff6-9092-7cc19e22acf4 vpn
1366020364 Mon 15 Apr 2013 11:06:04 BST no no
/org/freedesktop/NetworkManager/Settings/1
Wired connection 1 81386800-1e66-4f17-88d3-37233ab45958
802-3-ethernet 1366291620 Thu 18 Apr 2013 14:27:00 BST yes
no /org/freedesktop/NetworkManager/Settings/0
nmcli-dev:
DEVICE TYPE STATE DBUS-PATH
eth0 802-3-ethernet connected
/org/freedesktop/NetworkManager/Devices/0
nmcli-nm:
RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE
WIFI WWAN-HARDWARE WWAN
running 0.9.6.0 connected enabled enabled
enabled enabled disabled
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