Public bug reported:
I have Ubuntu Server 22.04.2
I have installed avahi-daemon and libnss-mdns, but mdns resolution is
not occurring over my primary network interface:
Note that this is with `allow-interfaces=ens160` set /etc/avahi/avahi-
daemon.conf.
(22:25:17 Sat May 27 2023 jeremy@cid pts/0 aarch64)
[648] ~ $ sudo resolvectl mdns ens160 1
(22:25:22 Sat May 27 2023 jeremy@cid pts/0 aarch64)
[649] ~ $ resolvectl status
Global
Protocols: -LLMNR +mDNS -DNSOverTLS DNSSEC=no/unsupported
resolv.conf mode: stub
Link 2 (ens160)
Current Scopes: DNS mDNS/IPv4 mDNS/IPv6
Protocols: +DefaultRoute +LLMNR +mDNS -DNSOverTLS DNSSEC=no/unsupported
Current DNS Server: 2601:647:6680:4b95::1
DNS Servers: 10.1.30.1 2601:647:6680:4b95::1
DNS Domain: localdomain
(22:25:27 Sat May 27 2023 jeremy@cid pts/0 aarch64)
[650] ~ $ avahi-resolve -n cid.local
Failed to resolve host name 'cid.local': Timeout reached
(22:26:03 Sat May 27 2023 jeremy@cid pts/0 aarch64)
[651] ~ $ avahi-resolve -a 10.0.30.1
Failed to resolve address '10.0.30.1': Timeout reached
(22:26:13 Sat May 27 2023 jeremy@cid pts/0 aarch64)
[652] ~ $ sudo systemctl status avahi-daemon
● avahi-daemon.service - Avahi mDNS/DNS-SD Stack
Loaded: loaded (/lib/systemd/system/avahi-daemon.service; enabled; vendor
preset: enabled)
Active: active (running) since Sat 2023-05-27 22:22:29 UTC; 3min 51s ago
TriggeredBy: ● avahi-daemon.socket
Main PID: 850 (avahi-daemon)
Status: "avahi-daemon 0.8 starting up."
Tasks: 2 (limit: 4523)
Memory: 1.5M
CPU: 15ms
CGroup: /system.slice/avahi-daemon.service
├─850 "avahi-daemon: running [cid.local]"
└─891 "avahi-daemon: chroot helper"
May 27 22:22:29 cid avahi-daemon[850]: No service file found in
/etc/avahi/services.
May 27 22:22:29 cid avahi-daemon[850]: Joining mDNS multicast group on
interface ens160.IPv6 with address 2601:647:6680:4b95:20c:29ff:fe42:f399.
May 27 22:22:29 cid avahi-daemon[850]: New relevant interface ens160.IPv6 for
mDNS.
May 27 22:22:29 cid avahi-daemon[850]: Joining mDNS multicast group on
interface ens160.IPv4 with address 10.1.30.2.
May 27 22:22:29 cid avahi-daemon[850]: New relevant interface ens160.IPv4 for
mDNS.
May 27 22:22:29 cid avahi-daemon[850]: Network interface enumeration completed.
May 27 22:22:29 cid avahi-daemon[850]: Registering new address record for
2601:647:6680:4b95:20c:29ff:fe42:f399 on ens160.*.
May 27 22:22:29 cid avahi-daemon[850]: Registering new address record for
10.1.30.2 on ens160.IPv4.
May 27 22:22:30 cid avahi-daemon[850]: Server startup complete. Host name is
cid.local. Local service cookie is 2371061072.
May 27 22:26:11 cid avahi-daemon[850]: wide-area.c: Query timed out.
(22:27:14 Sat May 27 2023 jeremy@cid pts/0 aarch64)
[657] ~ $ grep hosts /etc/nsswitch.conf
hosts: files mdns4_minimal [NOTFOUND=return] dns
---
If I set 'allow-interfaces=ens160,lo`, we are able to resolve cid.local
to localhost:
$ avahi-resolve -n cid.local
cid.local 127.0.0.1
but I cannot lookup anything else on my network via the ens160
interface.
I *can* resolve cid.local (10.1.30.2) from other devices on my network
for a brief moment after I restart avahi-daemon.
** Affects: avahi (Ubuntu)
Importance: Undecided
Status: New
** Project changed: launchpad => avahi (Ubuntu)
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https://bugs.launchpad.net/bugs/2021409
Title:
mdns failng with current versions of libnss-mdns and avahi-daemon
Status in avahi package in Ubuntu:
New
Bug description:
I have Ubuntu Server 22.04.2
I have installed avahi-daemon and libnss-mdns, but mdns resolution is
not occurring over my primary network interface:
Note that this is with `allow-interfaces=ens160` set /etc/avahi/avahi-
daemon.conf.
(22:25:17 Sat May 27 2023 jeremy@cid pts/0 aarch64)
[648] ~ $ sudo resolvectl mdns ens160 1
(22:25:22 Sat May 27 2023 jeremy@cid pts/0 aarch64)
[649] ~ $ resolvectl status
Global
Protocols: -LLMNR +mDNS -DNSOverTLS DNSSEC=no/unsupported
resolv.conf mode: stub
Link 2 (ens160)
Current Scopes: DNS mDNS/IPv4 mDNS/IPv6
Protocols: +DefaultRoute +LLMNR +mDNS -DNSOverTLS
DNSSEC=no/unsupported
Current DNS Server: 2601:647:6680:4b95::1
DNS Servers: 10.1.30.1 2601:647:6680:4b95::1
DNS Domain: localdomain
(22:25:27 Sat May 27 2023 jeremy@cid pts/0 aarch64)
[650] ~ $ avahi-resolve -n cid.local
Failed to resolve host name 'cid.local': Timeout reached
(22:26:03 Sat May 27 2023 jeremy@cid pts/0 aarch64)
[651] ~ $ avahi-resolve -a 10.0.30.1
Failed to resolve address '10.0.30.1': Timeout reached
(22:26:13 Sat May 27 2023 jeremy@cid pts/0 aarch64)
[652] ~ $ sudo systemctl status avahi-daemon
● avahi-daemon.service - Avahi mDNS/DNS-SD Stack
Loaded: loaded (/lib/systemd/system/avahi-daemon.service; enabled;
vendor preset: enabled)
Active: active (running) since Sat 2023-05-27 22:22:29 UTC; 3min 51s ago
TriggeredBy: ● avahi-daemon.socket
Main PID: 850 (avahi-daemon)
Status: "avahi-daemon 0.8 starting up."
Tasks: 2 (limit: 4523)
Memory: 1.5M
CPU: 15ms
CGroup: /system.slice/avahi-daemon.service
├─850 "avahi-daemon: running [cid.local]"
└─891 "avahi-daemon: chroot helper"
May 27 22:22:29 cid avahi-daemon[850]: No service file found in
/etc/avahi/services.
May 27 22:22:29 cid avahi-daemon[850]: Joining mDNS multicast group on
interface ens160.IPv6 with address 2601:647:6680:4b95:20c:29ff:fe42:f399.
May 27 22:22:29 cid avahi-daemon[850]: New relevant interface ens160.IPv6 for
mDNS.
May 27 22:22:29 cid avahi-daemon[850]: Joining mDNS multicast group on
interface ens160.IPv4 with address 10.1.30.2.
May 27 22:22:29 cid avahi-daemon[850]: New relevant interface ens160.IPv4 for
mDNS.
May 27 22:22:29 cid avahi-daemon[850]: Network interface enumeration
completed.
May 27 22:22:29 cid avahi-daemon[850]: Registering new address record for
2601:647:6680:4b95:20c:29ff:fe42:f399 on ens160.*.
May 27 22:22:29 cid avahi-daemon[850]: Registering new address record for
10.1.30.2 on ens160.IPv4.
May 27 22:22:30 cid avahi-daemon[850]: Server startup complete. Host name is
cid.local. Local service cookie is 2371061072.
May 27 22:26:11 cid avahi-daemon[850]: wide-area.c: Query timed out.
(22:27:14 Sat May 27 2023 jeremy@cid pts/0 aarch64)
[657] ~ $ grep hosts /etc/nsswitch.conf
hosts: files mdns4_minimal [NOTFOUND=return] dns
---
If I set 'allow-interfaces=ens160,lo`, we are able to resolve
cid.local to localhost:
$ avahi-resolve -n cid.local
cid.local 127.0.0.1
but I cannot lookup anything else on my network via the ens160
interface.
I *can* resolve cid.local (10.1.30.2) from other devices on my network
for a brief moment after I restart avahi-daemon.
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https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/2021409/+subscriptions
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