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What is IGMP multicast memberships?
The Internet Group Management Protocol (IGMP) is a communications protocol used by hosts and adjacent routers on IPv4 networks to establish multicast group memberships. IGMP is an integral part of IP multicast and allows the network to direct multicast transmissions only to hosts that have requested them.
How do multicast groups work?
An IP multicast group address is used by sources and the receivers to send and receive multicast messages. Sources use the group address as the IP destination address in their data packets. Receivers use this group address to inform the network that they are interested in receiving packets sent to that group.
What is a multicast querier?
The IGMP/MLD Snooping Querier is used to support a Layer 2 Multicast domain of snooping switches in the absence of a Multicast router. For example, where Multicast content is provided by a local server, but the router (if one exists) on that network does not support Multicast.
Which method is used to leave a group in multicast group?
leaveGroup(InetAddress mcastaddr) is the method of MulticastSocket class. This method is used to leave multicast group.
How does a multicast group work in a router?
Multicast group membership protocols allow a router to know when a host on a directly attached subnet, typically a LAN, wants to receive traffic from a certain multicast group.
How to use the remote multicast setup package?
The remote multicast setup package provides commands to perform the following operations: Query the implementation version of the package. Query the list and status of the multicast groups currently defined in a device. Create or modify a multicast group in a device. Delete a multicast group definition in a device.
What is the MAC group ID for multicast group?
The IPv6 multicast group addresses showing how the MAC group ID is embedded. Naturally, there are 80 more bits that could be used in the Group ID field. For now, RFC 2373 recommends setting the 80+ bits available for multicast group IDs to 0 s.
What is the reference time for a multicast group?
First, all the devices of a multicast group must share the same time. In LoRaWAN networks, the reference time is the GPS time, also called the GPS epoch.