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How are multicast packets forwarded inside the local network?
While Multicast routers route Multicast packets between IP subnets, Multicast- capable Layer 2 switches forward Multicast packets to registered nodes within a LAN or VLAN. These queries reach the switch, which in turn floods the queries to the VLAN, and also learns the port where there is a Multicast router (Mrouter).
Should I enable wireless multicast forwarding?
Wireless Multicast Forwarding (WMF) is an efficient way to forward traffic on the wireless network. It is commonly enabled in situations when there only interested hosts need to receive a multicast. Enabling this feature is useful to improve wireless connectivity in your network.
Should I enable IGMP snooping?
For a home based network, you should enable it when you frequently use any kind of streaming or mirroring from your devices to stream to Apple TV or Chromecast. In some brand firmware such as Asus, enabling IGMP Snooping can fix some of the Apple TV Airplay mirroring issues.
How to enable forwarding for a multicast IP?
When I host a LAN game on a computer (win7) for AoE2, Wireshark shows my computer sending a couple packets via SSDP protocol to the multicast address 239.255.255.250. This actually goes to my router (for forwarding I assume) and my router returns a packet using ICMP protocol that says “Destination unreachable (Port unreachable)”.
When does multicast routing not forward a packet?
Multicast routing does not forward a packet unless the source of the packet passes a RPF check. Once a packet passes this RPF check, multicast routing forwards the packet based only upon the destination address.
Do you need IGMP for multicast forwarding?
BTW the IGMP snooping works fine, but need running VLC to actively report its membership, after that I can see router forwarding multicast traffic. Routers do not forward multicast unless you have explicitly enabled multicast routing. That requires something like PIM. IGMP is a link-local protocol.
How to troubleshoot IP multicast with static mroute?
This static mroute states that to get to the address 1.1.1.1 for RPF, use 2.1.1.1 as the next hop which is out interface E3/1. The output of show ip mroute and debug ip mpacket looks good, the number of sent packets in the show ip mroute count increases, and HostA receives packets.