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How to enable/configure multicast?

reallinx

Hi,

I have the following setup:

  • Sophos XG 85 Firewall (Wifi)
  • DMZ Zone (VLAN 2 on Port 1)(10.0.1.0/24)
  • Wifi Zone (10.0.2.0/24)

I have the following devices:

  • Raspberry Pi as Home Assistant Host (Smart Home) in the DMZ zone
  • Xiaomi Smart Home Gateway in the WIFI zone (To talk to some humidity and temperature sensors)

The Problem:

The Raspberry Pi and the Xiaomi Device need to be able to talk to each other via multicast. I have looked at a packet capture and the Xiaomi Gateway is sending heartbeats like this: Destination 224.0.0.50, Protocol UDP

What changes to the firewall do I need to make? I already tried Multicast Forwarding to no avail. Since I never had to work with multicast I am a little bit lost.

Thank you in advance.

Chris



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  • +1

    I did a bit of investigation and in regard to the RFC-5571, the concerned multicast IP 224.0.0.50 is a part of the reserved 224.0.0.0/24 Local Network Control Block which cannot be routed. This requires to add 224.0.0.50 to PIM-SM, you can try configuring PIM-SM by referring to, Sophos XG Firewall: How to configure PIM-SM routing. Let us know if that helps.

    Thanks,

  • 0 in reply to sachingurung

    If I'm understanding this thread correctly, are you saying 'Multicast Forwarding' cannot be used to forward 224.0.0.* across VLANs?

     

    When I try to setup PIM-SM and enter 224.0.0.251 (for MDNS) into the Multicast Group List, I get the following error:

    "Invalid multicast group list IP as '224.0.0.251' is a part of reserved multicast address list used for different routing protocols"

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  • 0 in reply to sachingurung

    If I'm understanding this thread correctly, are you saying 'Multicast Forwarding' cannot be used to forward 224.0.0.* across VLANs?

     

    When I try to setup PIM-SM and enter 224.0.0.251 (for MDNS) into the Multicast Group List, I get the following error:

    "Invalid multicast group list IP as '224.0.0.251' is a part of reserved multicast address list used for different routing protocols"

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