Os hosts na mesma rede local não podem ver os serviços uns dos outros com o avahi-browse

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Edit: Eu acabei usando outra maneira de enviar um fluxo de áudio através da rede para um remoto Raspberry Pi com Pulseaudio - um que não envolve Avahi Então eu perdi o interesse nessa questão - não se incomode em responder a menos que você ache o problema extremamente excitante. Deixarei aqui de qualquer maneira, caso minhas incursões iniciais ajudem alguém.

Estou montando um Rapsberry Pi como um coletor remoto Pulseaudio. Em outro host na mesma LAN, 'export PULSE_SERVER="[2001: 470: ca90: 4: ba27: ebff: fee2: ada9]" & & mplayer sound.mp3 'me permite tocar música remotamente - até aí tudo bem. Também funciona bem no IPv4. O host do cliente é o Debian Jessie, o host do servidor é o Raspbian Jessie.

O Pulseaudio funciona no modo de sistema - um coletor sem cabeça é um dos poucos casos em que é preferível. As adições ao system.pa são as seguintes:

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

Eu removerei o 10.4.0.0/24 uma vez em produção - mas por enquanto eu quero ser capaz de testar de qualquer estação nesta sub-rede.

A seleção de um coletor Pulseaudio remoto requer que o avahi do servidor anuncie esse serviço corretamente. É onde estamos agora.

Localmente no host do servidor, o serviço Pulseaudio parece anunciado corretamente:

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

Mas outros hosts na mesma rede não conseguem ver o serviço 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

Esses três exemplos são outras estações de trabalho. Estranhamente, um deles nem sequer vê as outras estações de trabalho - embora eu acredite que ele seja configurado de forma semelhante.

Todos os quatro hosts envolvidos (Raspberry Pi e quatro computadores padrão da Intel) estão no mesmo segmento de Ethernet sem nenhum roteador intermediário. A conectividade IPv6 e IPv4 está bem. Nenhum iptables em qualquer host. Todos esses hosts têm uma configuração Avahi similar, usando IPv4 e IPv6 em qualquer interface disponível:

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

Bem ... Agora estou preso - que caminho devo estar cutucando?

Por sugestão do @growity, aqui estão algumas dicas sobre o que acontece no éter ...

Ouvindo a eth0 do Pulseaudio sink, reiniciar o daemon avahi desencadeia uma boa explosão dos pacotes MDNS esperados:

 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

Os pacotes direcionados ff02 :: fb e 224.0.0.251 na porta 5353 são exatamente o que deveria estar acontecendo na teoria - o que é bom.

Mas enquanto isso, nenhuma outra estação viu nada - nem um único pacote MDNS.

Alguns momentos depois em uma estação de trabalho:

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

E no roteador local:

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

Mas o dissipador Pulseaudio aqui considerado pertence a outra estação, não ao pi de framboesa que transmitiu a grande explosão acima. Se eu reiniciar o avahi naquela outra estação de publicidade, a explosão correta do MDNS será vista em ambos os hosts precedentes (amour & arua) ... Mas não na outra estação de trabalho (waga) nem no Raspberry Pi (hornwall) . Isso é estranho porque amour e waga são extremamente similarmente configurados, embora algo possa ter divergido.

Agora, por que nenhuma outra estação vê os pacotes MDNS que o Raspberry Pi parece estar transmitindo? Por que apenas duas estações veem os pacotes MDNS de propaganda difusora transmitidos pela outra estação? Pode haver um erro de configuração no lado de recebimento?

    
por Jean-Marc Liotier 31.05.2015 / 18:47

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