Macos

傳入的 UDP 多播流在 macOS 上的固定時間後停止

  • October 31, 2020

我的 ISP 提供 IPTV 功能，流範例：udp://@239.255.2.97:5500. 我想在 macOS 上觀看 IPTV，所以我使用了 VLC。

最初，IPTV 根本不起作用。起初我以為它以某種方式鎖定到了 ISP 的媒體盒。然後我在各種設備上進行了測試，它無處不在：執行 Windows 的同一台 Mac、Apple TV、Redmi 手機和各種 iOS 設備。經過一番Google搜尋後，我找到了解決方案：sudo sysctl net.inet.igmp.sendra=0在終端中執行使 VLC 播放流。（不需要強制預設版本為 2）

但後來我注意到流恰好在 04:20 ±1 秒後停止，只有重新啟動流才能讓它再次播放。這不會發生在上面提到的任何其他設備/平台上。我有 2 台 Mac——mbp 執行 Mojave（SIP 關閉）和 mini 執行 Catalina（SIP 開啟）——兩者都發生，有線/無線連接沒有區別，以及使用的軟體（嘗試過 VLC 和 Kodi）。

我完全不知道如何解決這個問題，並且在網際網路上找不到任何相關的東西，非常感謝您的幫助。

我會提供您需要的任何資訊，最好請發布必要的命令以獲得所需的資訊。

兩台 Mac 上的預設 IGMP 設置相同：

❯ sysctl net.inet.igmp
net.inet.igmp.recvifkludge: 1
net.inet.igmp.sendra: 1
net.inet.igmp.sendlocal: 1
net.inet.igmp.v1enable: 1
net.inet.igmp.v2enable: 1
net.inet.igmp.legacysupp: 0
net.inet.igmp.default_version: 3
net.inet.igmp.gsrdelay: 10
net.inet.igmp.debug: 0

ifconfig -a如果有幫助，這是我的 Mac：

無線 MBP：

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
   options=1203<RXCSUM,TXCSUM,TXSTATUS,SW_TIMESTAMP>
   inet 127.0.0.1 netmask 0xff000000 
   inet6 ::1 prefixlen 128 
   inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 
   nd6 options=201<PERFORMNUD,DAD>
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0<> mtu 1280
EHC250: flags=0<> mtu 0
EHC253: flags=0<> mtu 0
en0: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
   options=b<RXCSUM,TXCSUM,VLAN_HWTAGGING>
   ether 58:b0:35:f4:e6:de 
   nd6 options=201<PERFORMNUD,DAD>
   media: autoselect (none)
   status: inactive
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
   ether 58:b0:35:7a:2f:13 
   inet6 fe80::108d:a3b7:c229:4e24%en1 prefixlen 64 secured scopeid 0x7 
   inet 192.168.1.69 netmask 0xffffff00 broadcast 192.168.1.255
   inet6 2a00:1370:8131:b399:803:904:7e51:a50b prefixlen 64 autoconf secured 
   inet6 2a00:1370:8131:b399:7944:3d6c:3303:58b prefixlen 64 autoconf temporary 
   inet6 2a00:1370:8131:b399:f628:52b3:28ae:8d54 prefixlen 64 dynamic 
   nd6 options=201<PERFORMNUD,DAD>
   media: autoselect
   status: active
fw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 4078
   lladdr d8:30:62:ff:fe:f0:e9:aa 
   nd6 options=201<PERFORMNUD,DAD>
   media: autoselect <full-duplex>
   status: inactive
p2p0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 2304
   ether 0a:b0:35:7a:2f:13 
   media: autoselect
   status: inactive
utun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 2000
   inet6 fe80::83e0:2ce2:8c0d:e1a7%utun0 prefixlen 64 scopeid 0xa 
   nd6 options=201<PERFORMNUD,DAD>
bridge100: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
   options=3<RXCSUM,TXCSUM>
   ether 5a:b0:35:4f:b0:64 
   inet 192.168.2.1 netmask 0xffffff00 broadcast 192.168.2.255
   inet6 fe80::58b0:35ff:fe4f:b064%bridge100 prefixlen 64 scopeid 0xb 
   Configuration:
       id 0:0:0:0:0:0 priority 0 hellotime 0 fwddelay 0
       maxage 0 holdcnt 0 proto stp maxaddr 100 timeout 1200
       root id 0:0:0:0:0:0 priority 0 ifcost 0 port 0
       ipfilter disabled flags 0x2
   member: en0 flags=3<LEARNING,DISCOVER>
           ifmaxaddr 0 port 6 priority 0 path cost 0
   nd6 options=201<PERFORMNUD,DAD>
   media: <unknown type>
   status: inactive

有線迷你：

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
   options=1203<RXCSUM,TXCSUM,TXSTATUS,SW_TIMESTAMP>
   inet 127.0.0.1 netmask 0xff000000 
   inet6 ::1 prefixlen 128 
   inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 
   nd6 options=201<PERFORMNUD,DAD>
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0<> mtu 1280
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
   options=50b<RXCSUM,TXCSUM,VLAN_HWTAGGING,AV,CHANNEL_IO>
   ether 14:9d:99:7c:63:cc 
   inet6 fe80::ee:83f2:5357:c607%en0 prefixlen 64 secured scopeid 0x4 
   inet6 2a00:1370:8131:b399:4b6:9a5b:7712:e480 prefixlen 64 autoconf secured 
   inet6 2a00:1370:8131:b399:b837:ed92:a5dc:5859 prefixlen 64 autoconf temporary 
   inet6 2a00:1370:8131:b399:2846:2489:ad80:fc9b prefixlen 64 dynamic 
   inet 192.168.1.65 netmask 0xffffff00 broadcast 192.168.1.255
   nd6 options=201<PERFORMNUD,DAD>
   media: autoselect (1000baseT <full-duplex,flow-control>)
   status: active
en6: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
   ether ac:de:48:00:11:22 
   inet6 fe80::aede:48ff:fe00:1122%en6 prefixlen 64 scopeid 0x5 
   nd6 options=201<PERFORMNUD,DAD>
   media: autoselect (100baseTX <full-duplex>)
   status: active
ap1: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
   options=400<CHANNEL_IO>
   ether 3e:22:fb:a8:1b:69 
   media: autoselect
   status: inactive
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
   options=400<CHANNEL_IO>
   ether 3c:22:fb:a8:1b:69 
   inet6 fe80::805:ed7:b180:94c0%en1 prefixlen 64 secured scopeid 0x7 
   inet 169.254.31.79 netmask 0xffff0000 broadcast 169.254.255.255
   nd6 options=201<PERFORMNUD,DAD>
   media: autoselect (<unknown type>)
p2p0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 2304
   options=400<CHANNEL_IO>
   ether 0e:22:fb:a8:1b:69 
   media: autoselect
   status: inactive
awdl0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1484
   options=400<CHANNEL_IO>
   ether a6:cb:ac:da:de:6b 
   inet6 fe80::a4cb:acff:feda:de6b%awdl0 prefixlen 64 scopeid 0x9 
   nd6 options=201<PERFORMNUD,DAD>
   media: autoselect
   status: active
llw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
   options=400<CHANNEL_IO>
   ether a6:cb:ac:da:de:6b 
   inet6 fe80::a4cb:acff:feda:de6b%llw0 prefixlen 64 scopeid 0xa 
   nd6 options=201<PERFORMNUD,DAD>
   media: autoselect
   status: active
en2: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
   options=460<TSO4,TSO6,CHANNEL_IO>
   ether 82:fa:d0:e2:c0:01 
   media: autoselect <full-duplex>
   status: inactive
en3: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
   options=460<TSO4,TSO6,CHANNEL_IO>
   ether 82:fa:d0:e2:c0:00 
   media: autoselect <full-duplex>
   status: inactive
en4: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
   options=460<TSO4,TSO6,CHANNEL_IO>
   ether 82:fa:d0:e2:c0:05 
   media: autoselect <full-duplex>
   status: inactive
en5: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
   options=460<TSO4,TSO6,CHANNEL_IO>
   ether 82:fa:d0:e2:c0:04 
   media: autoselect <full-duplex>
   status: inactive
bridge0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
   options=63<RXCSUM,TXCSUM,TSO4,TSO6>
   ether 82:fa:d0:e2:c0:01 
   Configuration:
       id 0:0:0:0:0:0 priority 0 hellotime 0 fwddelay 0
       maxage 0 holdcnt 0 proto stp maxaddr 100 timeout 1200
       root id 0:0:0:0:0:0 priority 0 ifcost 0 port 0
       ipfilter disabled flags 0x0
   member: en2 flags=3<LEARNING,DISCOVER>
           ifmaxaddr 0 port 11 priority 0 path cost 0
   member: en3 flags=3<LEARNING,DISCOVER>
           ifmaxaddr 0 port 12 priority 0 path cost 0
   member: en4 flags=3<LEARNING,DISCOVER>
           ifmaxaddr 0 port 13 priority 0 path cost 0
   member: en5 flags=3<LEARNING,DISCOVER>
           ifmaxaddr 0 port 14 priority 0 path cost 0
   nd6 options=201<PERFORMNUD,DAD>
   media: <unknown type>
   status: inactive
utun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
   inet6 fe80::93a6:b158:9d1a:86ee%utun0 prefixlen 64 scopeid 0x10 
   nd6 options=201<PERFORMNUD,DAD>
utun1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 2000
   inet6 fe80::fef3:61fc:6994:82c4%utun1 prefixlen 64 scopeid 0x11 
   nd6 options=201<PERFORMNUD,DAD>
en8: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
   options=400<CHANNEL_IO>
   ether da:1c:79:6f:03:9d 
   inet6 fe80::18db:f66f:c81d:54d0%en8 prefixlen 64 secured scopeid 0x14 
   inet 169.254.172.225 netmask 0xffff0000 broadcast 169.254.255.255
   nd6 options=201<PERFORMNUD,DAD>
   media: autoselect (100baseTX <full-duplex>)
   status: active

解決方案。將以下規則添加到/etc/pf.conf：

anchor "multicast" {
 pass proto igmp allow-opts
 pass quick from any to { 224.0.0.0/4 ff00::/8 } allow-opts
}

（也可以將規則放在單獨的文件中並將它們附加到錨點，請參閱 PF 手冊）

sudo sysctl net.inet.igmp.sendra=0黑客不再需要。

問題的來源。Private Internet Access 應用程序啟用 PF 防火牆並載入其自己的規則，這些規則顯然禁用了 IGMP / 多播。即使 PIA 應用程序未執行，也會發生這種情況。我已經聯繫了 PIA 支持，希望他們能修復它。

調查細節。

  • tcpdump透露 Mac 不會響應來自路由器的 IGMP 請求。
  • 神奇的 04:20 時間是 125 * 2 + 10，其中 125 是查詢間隔，10 是我路由器上 IGMP 代理中設置的查詢響應超時。
  • 我發現 macOS 有預設禁用的 PF 防火牆，但在兩台機器上都啟用了它。sudo pfctl -d通過固定的 IPTV 和 IGMP 響應禁用它。
  • 在（Apple 預設規則）中找到的禁用規則/etc/pf.conf沒有任何效果，然後我通過sudo pfctl -sr:發現了 PIA 的規則anchor "com.privateinternetaccess.vpn/*" all。
  • 從 Murus（PF 的 UI）抓取 IGMP + 多播規則（在解決方案中列出），瞧！

引用自：https://unix.stackexchange.com/questions/616847

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