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    igmpproxy fail to route after old multicast group is removed from table

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    • T
      toto456
      last edited by

      Hi, I am using netgate with pfSense v2.4.4-RELEASE-p3.
      It has igmpproxy v0.2.1.

      I am trying to set up multicast stream with source in LAN and and host client in WAN.
      LAN network 10.14.0.0/24 iface mvneta1
      WAN network 10.15.0.0/24 iface mvneta2

      here is my routes
      Routing tables:

      Internet:
      Destination Gateway Flags Netif Expire
      default 10.10.15.95 UGS mvneta2
      10.15.0.0/24 link#8 U mvneta2
      10.15.0.95 link#8 UHS lo0
      10.14.0.0/24 link#2 U mvneta1
      10.14.0.1 link#2 UHS lo0
      127.0.0.1 link#10 UH lo0
      208.67.220.220 00:08:a2:0f:7d:69 UHS mvneta2
      208.67.222.222 00:08:a2:0f:7d:69 UHS mvneta2

      here is my igmpproxy.conf:
      quickleave
      phyint mvneta1 upstream ratelimit 0 threshold 5
      altnet 10.14.0.0/24

      phyint mvneta2 downstream ratelimit 0 threshold 1
      altnet 10.15.0.0/24

      I have:
      - a server in LAN that send multicast on 224.1.1.1 and sending continuously
      (it is running iperf -c 224.1.1.1 -u -T 32 -t 3600 -i 1)
      - a client in WAN that try try to join that multicast address
      (it is running iperf -s -u -B 224.1.1.1 -i 1)

      when I start igmpproxy in debug mode, it works fine and table has:

      Current routing table (Activate Route):
      #0: Src0: 10.14.0.2, Dst: 224.1.1.1, Age:1, St: A, OutVifs: 0x00000002
      #1: Dst: 224.0.0.251, Age:2, St: I, OutVifs: 0x00000002
      #2: Dst: 239.255.255.253, Age:1, St: I, OutVifs: 0x00000002

      my Listener is able to listen to multicast.However if I stop the listener and the sender is still sending, after some time the route to the group is removed:

      About to call timeout 26 (#0)
      Aging routes in table.
      Removing group 224.1.1.1. Died of old age.
      Removed route entry for 224.1.1.1 from table.
      Vif bits : 0x00000002
      Removing MFC: 10.14.0.2 -> 224.1.1.1, InpVIf: 2
      MRT_DEL_MFC; Errno(49): Can't assign requested address

      Current routing table (Delete Route):
      #1: Dst: 224.0.0.251, Age:2, St: I, OutVifs: 0x00000002
      #2: Dst: 239.255.255.253, Age:2, St: I, OutVifs: 0x00000002

      If I restart the listener, the route will be added without Src:
      #0: Dst: 224.1.1.1, Age:2, St: I, OutVifs: 0x00000002
      #1: Dst: 224.0.0.251, Age:2, St: I, OutVifs: 0x00000002
      #2: Dst: 239.255.255.253, Age:2, St: I, OutVifs: 0x00000002

      but listener will fail to get multicast. Only solution to this:

      • restart igmpproxy
      • or restart multicast source

      is it how it is suppose to work?

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