Редактировать: я закончил тем, что использовал другой способ отправки аудиопотока по сети на удаленный Raspberry Pi с Pulseaudio - тот, который не использует Avahi... Так что я потерял интерес к этому вопросу - не пытайтесь отвечать на него, если вы не находите проблему чрезвычайно захватывающей. Я все равно оставлю это здесь, на случай, если мои первоначальные набеги кому-нибудь помогут.

Я устанавливаю Rapsberry Pi в качестве пульта дистанционного управления Pulseaudio. На другом хосте в той же локальной сети 'export PULSE_SERVER = "[2001:470:ca90:4:ba27:ebff:fee2:ada9]" && mplayer sound.mp3' позволяет мне воспроизводить музыку удаленно - пока что это хорошо. Он хорошо работает и по IPv4. Хост клиента - Debian Jessie, хост сервера - Raspbian Jessie.

Pulseaudio работает в системном режиме - мойка без головы является одним из немногих случаев, когда это предпочтительнее. Дополнения к system.pa заключаются в следующем:

load-module module-native-protocol-tcp auth-ip-acl=127.0.0.1;10.4.0.0/24;2001:470:ca90:4:21b:21ff:feaa:99c9
load-module module-zeroconf-publish

Я удалю 10.4.0.0/24 один раз в работе - но сейчас я хочу иметь возможность проводить тестирование с любой станции в этой подсети.

Выбор удаленного приемника Pulseaudio требует от сервера avahi для правильной рекламы этой услуги. Это где мы сейчас.

Локально на хосте сервера служба Pulseaudio выглядит правильно:

root@hornwall:~# avahi-browse -a -t
+   eth0 IPv6 pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo PulseAudio Sound Sink local
+   eth0 IPv6 pulse@hornwall: bcm2835 ALSA Analog Stereo    PulseAudio Sound Sink local
+   eth0 IPv4 pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo PulseAudio Sound Sink local
+   eth0 IPv4 pulse@hornwall: bcm2835 ALSA Analog Stereo    PulseAudio Sound Sink local
+   eth0 IPv6 pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo PulseAudio Sound Source local
+   eth0 IPv4 pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo PulseAudio Sound Source local
+   eth0 IPv6 pulse@hornwall                                PulseAudio Sound Server local
+   eth0 IPv4 pulse@hornwall                                PulseAudio Sound Server local
+   eth0 IPv6 hornwall [b8:27:eb:e2:ad:a9]                  Workstation          local
+   eth0 IPv4 hornwall [b8:27:eb:e2:ad:a9]                  Workstation          local

Но другие хосты в той же сети не видят службу Pulseaudio:

root@Kitandara:/etc/pulse# avahi-browse -a -t
+   eth1 IPv6 amour                                         Remote Disk Management local
+   eth1 IPv4 amour                                         Remote Disk Management local
+   eth1 IPv6 amour [54:04:a6:67:9b:53]                     Workstation          local
+   eth1 IPv6 Kitandara [00:1b:21:aa:99:c9]                 Workstation          local
+   eth1 IPv4 amour [54:04:a6:67:9b:53]                     Workstation          local
+   eth1 IPv4 Kitandara [00:1b:21:aa:99:c9]                 Workstation          local
+   eth2 IPv6 Kitandara [00:1b:21:aa:99:cd]                 Workstation          local
+   eth2 IPv4 Kitandara [00:1b:21:aa:99:cd]                 Workstation          local

root@amour:~# avahi-browse -a -t
+   eth0 IPv6 amour                                         Remote Disk Management local
+   eth0 IPv4 amour                                         Remote Disk Management local
+   eth0 IPv6 amour [54:04:a6:67:9b:53]                     Workstation          local
+   eth0 IPv6 Kitandara [00:1b:21:aa:99:c9]                 Workstation          local
+   eth0 IPv4 amour [54:04:a6:67:9b:53]                     Workstation          local
+   eth0 IPv4 Kitandara [00:1b:21:aa:99:c9]                 Workstation          local

root@waga:~# avahi-browse -a -t
+   eth0 IPv6 waga                                          Remote Disk Management local
+   eth0 IPv4 waga                                          Remote Disk Management local
+   eth0 IPv6 waga [54:04:a6:67:9b:b7]                      Workstation          local
+   eth0 IPv4 waga [54:04:a6:67:9b:b7]                      Workstation          local

Эти три примера - другие рабочие станции. Как ни странно, одна из них даже не видит другие рабочие станции - хотя я считаю, что она настроена аналогичным образом.

Все четыре задействованных хоста (Raspberry Pi и четыре стандартных компьютера Intel) находятся в одном сегменте Ethernet без промежуточного маршрутизатора. Оба IPv6 и IPv4 подключения в порядке. Нет iptables на любом хосте. Все эти хосты имеют одинаковую конфигурацию Avahi, используя IPv4 и IPv6 на любом доступном интерфейсе:

root@Kitandara:/etc/pulse# grep -v ^# /etc/avahi/avahi-daemon.conf

[server]
use-ipv4=yes
use-ipv6=yes
ratelimit-interval-usec=1000000
ratelimit-burst=1000

[wide-area]
enable-wide-area=yes

[publish]

[reflector]

[rlimits]
rlimit-core=0
rlimit-data=4194304
rlimit-fsize=0
rlimit-nofile=768
rlimit-stack=4194304
rlimit-nproc=3

Что ж... Теперь я застрял - в какую сторону я должен подталкивать?

По предложению @ grawity, вот немного понимания того, что происходит через эфир ...

Прослушивание eth0 приемника Pulseaudio, перезапуск демона avahi дает хороший всплеск ожидаемых пакетов MDNS:

 56  12.938605 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 450 Standard query 0x0000  ANY hornwall [b8:27:eb:e2:ad:a9]._workstation._tcp.local, "QM" question ANY pulse@hornwall._pulse-server._tcp.local, "QM" question
 57  12.939394   10.4.0.202 -> 224.0.0.251  MDNS 430 Standard query 0x0000  ANY hornwall [b8:27:eb:e2:ad:a9]._workstation._tcp.local, "QM" question ANY pulse@hornwall._pulse-server._tcp.local, "QM" question
 58  12.994690 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 849 Standard query 0x0000  ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local, "QM" question ANY pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local, "QM" question
 59  12.995632   10.4.0.202 -> 224.0.0.251  MDNS 829 Standard query 0x0000  ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local, "QM" question ANY pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local, "QM" question
 60  13.019775 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 652 Standard query 0x0000  ANY pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local, "QM" question ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local, "QM" question
 61  13.020848   10.4.0.202 -> 224.0.0.251  MDNS 632 Standard query 0x0000  ANY pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local, "QM" question ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local, "QM" question
 62  13.049454 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 738 Standard query 0x0000  ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local, "QM" question
 63  13.050227   10.4.0.202 -> 224.0.0.251  MDNS 718 Standard query 0x0000  ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local, "QM" question
 64  13.188819 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 450 Standard query 0x0000  ANY hornwall [b8:27:eb:e2:ad:a9]._workstation._tcp.local, "QM" question ANY pulse@hornwall._pulse-server._tcp.local, "QM" question
 65  13.189735   10.4.0.202 -> 224.0.0.251  MDNS 430 Standard query 0x0000  ANY hornwall [b8:27:eb:e2:ad:a9]._workstation._tcp.local, "QM" question ANY pulse@hornwall._pulse-server._tcp.local, "QM" question
 66  13.245302 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 849 Standard query 0x0000  ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local, "QM" question ANY pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local, "QM" question
 67  13.246325   10.4.0.202 -> 224.0.0.251  MDNS 829 Standard query 0x0000  ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local, "QM" question ANY pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local, "QM" question
 68  13.270384 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 652 Standard query 0x0000  ANY pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local, "QM" question ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local, "QM" question
 69  13.271250   10.4.0.202 -> 224.0.0.251  MDNS 632 Standard query 0x0000  ANY pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local, "QM" question ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local, "QM" question
 70  13.299927 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 738 Standard query 0x0000  ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local, "QM" question
 71  13.300792   10.4.0.202 -> 224.0.0.251  MDNS 718 Standard query 0x0000  ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local, "QM" question
 72  13.439241 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 450 Standard query 0x0000  ANY hornwall [b8:27:eb:e2:ad:a9]._workstation._tcp.local, "QM" question ANY pulse@hornwall._pulse-server._tcp.local, "QM" question
 73  13.440068   10.4.0.202 -> 224.0.0.251  MDNS 430 Standard query 0x0000  ANY hornwall [b8:27:eb:e2:ad:a9]._workstation._tcp.local, "QM" question ANY pulse@hornwall._pulse-server._tcp.local, "QM" question
 74  13.496557 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 849 Standard query 0x0000  ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local, "QM" question ANY pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local, "QM" question
 75  13.497498   10.4.0.202 -> 224.0.0.251  MDNS 829 Standard query 0x0000  ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local, "QM" question ANY pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local, "QM" question
 76  13.521724 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 652 Standard query 0x0000  ANY pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local, "QM" question ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local, "QM" question
 77  13.522523   10.4.0.202 -> 224.0.0.251  MDNS 632 Standard query 0x0000  ANY pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local, "QM" question ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local, "QM" question
 78  13.551102 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 738 Standard query 0x0000  ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local, "QM" question
 79  13.551881   10.4.0.202 -> 224.0.0.251  MDNS 718 Standard query 0x0000  ANY pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local, "QM" question
 80  13.640087   10.4.0.202 -> 224.0.0.251  MDNS 243 Standard query response 0x0000  TXT, cache flush PTR hornwall [b8:27:eb:e2:ad:a9]._workstation._tcp.local SRV, cache flush 0 0 9 hornwall.local AAAA, cache flush 2001:470:ca90:4:ba27:ebff:fee2:ada9 A, cache flush 10.4.0.202 PTR _workstation._tcp.local
 81  13.641352 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 247 Standard query response 0x0000  TXT, cache flush PTR hornwall [b8:27:eb:e2:ad:a9]._workstation._tcp.local SRV, cache flush 0 0 9 hornwall.local AAAA, cache flush 2001:470:ca90:4:ba27:ebff:fee2:ada9 PTR _workstation._tcp.local
 82  13.683214   10.4.0.202 -> 224.0.0.251  MDNS 394 Standard query response 0x0000  TXT, cache flush PTR pulse@hornwall._pulse-server._tcp.local SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-server._tcp.local
 83  13.684306 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 414 Standard query response 0x0000  TXT, cache flush PTR pulse@hornwall._pulse-server._tcp.local SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-server._tcp.local
 84  13.700770   10.4.0.202 -> 224.0.0.251  MDNS 849 Standard query response 0x0000  TXT, cache flush PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-source._tcp.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local
 85  13.702406 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 869 Standard query response 0x0000  TXT, cache flush PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-source._tcp.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local
 86  13.725697   10.4.0.202 -> 224.0.0.251  MDNS 643 Standard query response 0x0000  TXT, cache flush PTR pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-sink._tcp.local PTR pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local
 87  13.727151 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 663 Standard query response 0x0000  TXT, cache flush PTR pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-sink._tcp.local PTR pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local
 88  13.762306   10.4.0.202 -> 224.0.0.251  MDNS 784 Standard query response 0x0000  TXT, cache flush PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local SRV, cache flush 0 0 4713 hornwall.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local
 89  13.763689 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 804 Standard query response 0x0000  TXT, cache flush PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local SRV, cache flush 0 0 4713 hornwall.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local
 90  13.872390   10.4.0.202 -> 224.0.0.251  MDNS 187 Standard query response 0x0000  PTR, cache flush hornwall.local PTR, cache flush hornwall.local
 91  13.873522 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 174 Standard query response 0x0000  PTR, cache flush hornwall.local
 92  13.895013   10.4.0.202 -> 224.0.0.251  MDNS 93 Standard query response 0x0000  HINFO, cache flush ARMV6L LINUX
 93  13.895711 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 113 Standard query response 0x0000  HINFO, cache flush ARMV6L LINUX
 94  14.685743   10.4.0.202 -> 224.0.0.251  MDNS 243 Standard query response 0x0000  TXT, cache flush PTR hornwall [b8:27:eb:e2:ad:a9]._workstation._tcp.local SRV, cache flush 0 0 9 hornwall.local AAAA, cache flush 2001:470:ca90:4:ba27:ebff:fee2:ada9 A, cache flush 10.4.0.202 PTR _workstation._tcp.local
 95  14.686990 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 247 Standard query response 0x0000  TXT, cache flush PTR hornwall [b8:27:eb:e2:ad:a9]._workstation._tcp.local SRV, cache flush 0 0 9 hornwall.local AAAA, cache flush 2001:470:ca90:4:ba27:ebff:fee2:ada9 PTR _workstation._tcp.local
 96  14.727907   10.4.0.202 -> 224.0.0.251  MDNS 394 Standard query response 0x0000  TXT, cache flush PTR pulse@hornwall._pulse-server._tcp.local SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-server._tcp.local
 97  14.729184 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 414 Standard query response 0x0000  TXT, cache flush PTR pulse@hornwall._pulse-server._tcp.local SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-server._tcp.local
 98  14.745767   10.4.0.202 -> 224.0.0.251  MDNS 849 Standard query response 0x0000  TXT, cache flush PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-source._tcp.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local
 99  14.747376 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 869 Standard query response 0x0000  TXT, cache flush PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-source._tcp.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local
100  14.769576   10.4.0.202 -> 224.0.0.251  MDNS 629 Standard query response 0x0000  TXT, cache flush SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-sink._tcp.local PTR pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local
101  14.770904 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 649 Standard query response 0x0000  TXT, cache flush SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-sink._tcp.local PTR pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local
102  14.807296   10.4.0.202 -> 224.0.0.251  MDNS 841 Standard query response 0x0000  TXT, cache flush PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local SRV, cache flush 0 0 4713 hornwall.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local PTR pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local
103  14.809329 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 861 Standard query response 0x0000  TXT, cache flush PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local SRV, cache flush 0 0 4713 hornwall.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local PTR pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local
104  15.917331   10.4.0.202 -> 224.0.0.251  MDNS 231 Standard query response 0x0000  PTR, cache flush hornwall.local A, cache flush 10.4.0.202 PTR, cache flush hornwall.local AAAA, cache flush 2001:470:ca90:4:ba27:ebff:fee2:ada9
105  15.918460 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 202 Standard query response 0x0000  PTR, cache flush hornwall.local AAAA, cache flush 2001:470:ca90:4:ba27:ebff:fee2:ada9
106  15.939179   10.4.0.202 -> 224.0.0.251  MDNS 93 Standard query response 0x0000  HINFO, cache flush ARMV6L LINUX
107  15.942478 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 113 Standard query response 0x0000  HINFO, cache flush ARMV6L LINUX
108  16.730511   10.4.0.202 -> 224.0.0.251  MDNS 243 Standard query response 0x0000  TXT, cache flush PTR hornwall [b8:27:eb:e2:ad:a9]._workstation._tcp.local SRV, cache flush 0 0 9 hornwall.local AAAA, cache flush 2001:470:ca90:4:ba27:ebff:fee2:ada9 A, cache flush 10.4.0.202 PTR _workstation._tcp.local
109  16.731652 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 247 Standard query response 0x0000  TXT, cache flush PTR hornwall [b8:27:eb:e2:ad:a9]._workstation._tcp.local SRV, cache flush 0 0 9 hornwall.local AAAA, cache flush 2001:470:ca90:4:ba27:ebff:fee2:ada9 PTR _workstation._tcp.local
110  16.772372   10.4.0.202 -> 224.0.0.251  MDNS 394 Standard query response 0x0000  TXT, cache flush PTR pulse@hornwall._pulse-server._tcp.local SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-server._tcp.local
111  16.773610 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 414 Standard query response 0x0000  TXT, cache flush PTR pulse@hornwall._pulse-server._tcp.local SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-server._tcp.local
112  16.789610   10.4.0.202 -> 224.0.0.251  MDNS 835 Standard query response 0x0000  TXT, cache flush SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-source._tcp.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local
113  16.791221 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 855 Standard query response 0x0000  TXT, cache flush SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-source._tcp.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local
114  16.814388   10.4.0.202 -> 224.0.0.251  MDNS 714 Standard query response 0x0000  TXT, cache flush SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-sink._tcp.local PTR pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local
115  16.815894 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 734 Standard query response 0x0000  TXT, cache flush SRV, cache flush 0 0 4713 hornwall.local PTR _pulse-sink._tcp.local PTR pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-source._tcp.local
116  16.850830   10.4.0.202 -> 224.0.0.251  MDNS 827 Standard query response 0x0000  TXT, cache flush SRV, cache flush 0 0 4713 hornwall.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local PTR pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local
117  16.852697 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 847 Standard query response 0x0000  TXT, cache flush SRV, cache flush 0 0 4713 hornwall.local PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local PTR pulse@hornwall: bcm2835 ALSA Analog Stereo._pulse-sink._tcp.local
118  16.891486   10.4.0.202 -> 224.0.0.251  MDNS 147 Standard query response 0x0000  PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local
119  16.892429 2001:470:ca90:4:ba27:ebff:fee2:ada9 -> ff02::fb     MDNS 167 Standard query response 0x0000  PTR pulse@hornwall: Sound Blaster X-Fi Go! Pro Analog Stereo._pulse-sink._tcp.local

Пакеты, направленные ff02::fb и 224.0.0.251 через порт 5353, как раз то, что должно происходить в теории - это хорошо.

Но между тем ни одна другая станция не видела ничего - ни одного пакета MDNS.

Несколько мгновений спустя на рабочей станции:

root@amour:~# tshark -i eth0 -f "port 5353"
  1   0.000000 2001:470:ca90:4:21b:21ff:feaa:99c9 -> ff02::fb     MDNS 140 Standard query 0x0000  PTR _pulse-sink._tcp.local, "QM" question PTR _non-monitor._sub._pulse-source._tcp.local, "QM" question
  2   0.000031   10.4.0.124 -> 224.0.0.251  MDNS 120 Standard query 0x0000  PTR _pulse-sink._tcp.local, "QM" question PTR _non-monitor._sub._pulse-source._tcp.local, "QM" question

И на локальном роутере:

root@arua:~# tshark -i vlan4 -f "port 5353"
  1   0.000000 2001:470:ca90:4:21b:21ff:feaa:99c9 -> ff02::fb     MDNS 140 Standard query 0x0000  PTR _pulse-sink._tcp.local, "QM" question PTR _non-monitor._sub._pulse-source._tcp.local, "QM" question
  2   0.000135   10.4.0.124 -> 224.0.0.251  MDNS 120 Standard query 0x0000  PTR _pulse-sink._tcp.local, "QM" question PTR _non-monitor._sub._pulse-source._tcp.local, "QM" question

Но раковина Pulseaudio, объявленная здесь, принадлежит другой станции, а не Raspberry pi, которая транслирует большой взрыв выше. Если я перезапущу avahi на другой станции-приемнике рекламы, то на обоих предыдущих хостах будет виден правильный пакет MDNS (amour & arua) ... Но не на другой рабочей станции (вага) и не на Raspberry Pi (hornwall). Это странно, потому что настройки amour и waga чрезвычайно похожи, хотя, возможно, что-то могло разойтись.

Теперь, почему никакая другая станция не видит пакеты MDNS, которые, кажется, передает Raspberry Pi? Почему только две станции видят пакеты MDNS рекламы-приемника, передаваемые другой станцией? Может ли быть неправильная конфигурация на принимающей стороне?

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