Wireless Mobile & Multimedia Networking Lecture 2: IGMP

A unique identifier assigned to a network interface card (NIC) by the manufacturer. It's used to identify individual devices on a network.

A special MAC address that allows a device to send a single frame to all other devices on a network.

A specific MAC address used to transmit data to a group of devices. It allows targeted communication with a select set of receivers.

A range of IP addresses designed for multicast communication, starting with 224.0.0.0.

A way to determine the specific multicast members within your network. It involves protocols to track membership and ensure efficient data delivery.

A command-line utility used to gather network information and statistics. It offers options to display IP addresses, routing tables, and various network connections.

A single network entry in the routing table that indicates the network address, gateway address, network mask, interface through which the network can be reached, and other relevant metrics.

A packet containing a multicast address in the range 224.0.0.0 to 239.255.255.255 is automatically delivered to the Ethernet interface. This shows that the device is ready to receive multicast traffic.

A network protocol that allows hosts to join and leave multicast groups, helping routers keep track of group membership.

A router that keeps track of hosts participating in multicast groups. It forwards data only to hosts that have joined a specific group.

IGMP version 1, an older version that doesn't have a mechanism for hosts to explicitly leave a multicast group. Membership timeouts are used to determine if a host has left.

IGMP version 2, an improved version that includes a mechanism for explicit leaving of a multicast group. Routers can query for group members.

IGMP version 3, the latest version that allows receivers to filter traffic sources, providing more control over incoming multicast data.

A request sent by routers to discover hosts belonging to specific multicast groups.

A message sent by hosts to respond to IGMP queries or to indicate joining or leaving a multicast group.

A multicast address range used for administrative purposes. It is reserved for routing protocols and low-level network management tasks. These addresses are not used for general data transmission.

It is used for group membership management in multicast communication. It allows hosts to inform their local router about their interest in joining specific multicast groups, enabling the router to efficiently forward multicast data packets to the right members.

A network that uses multicast addresses allows sending a data packet to multiple receivers with a single transmission. This addresses the need for efficient data delivery to multiple recipients in various scenarios, like video conferencing or streaming to multiple users.

Class D addresses are specifically designed for multicast communication. They allow the grouping of multiple receivers who share interest in the same data stream. The 28-bit multicast group ID within the Class D address acts as a unique identifier for the multicast group.

Multicast addresses are dynamic. When an application using multicast addresses is closed or terminated, the address is automatically released. This prevents resource conflicts and ensures efficient address allocation. However, there are also permanent multicast groups reserved for protocol-specific communication.

An Autonomous System (AS) is a group of networks under a single administrative domain. In multicast networking, each AS is assigned a specific range of multicast addresses, ensuring efficient and organized address allocation within the AS.

It specifies a group of recipients who share interest in the same data stream. The multicast group ID serves as a unique identifier, indicating the specific group of recipients. Each group is defined by a specific multicast address.

Multicast addresses are used for efficient data delivery to multiple receivers simultaneously. This is achieved by sending a single data packet that is replicated and then forwarded to all the members of the multicast group, instead of sending separate packets to each recipient.

Maximum time a host can wait before responding to a query.

A mechanism to avoid sending duplicate reports within a group. If a host receives another host's report, it stops its own report timer, limiting redundant messages.

A parameter used in IP Multicast datagrams to control the number of hops a multicast packet can travel. It restricts the multicast group's reach to the local network (TTL = 1) or allows propagation through routers (TTL > 1).

IGMP messages are always sent with TTL = 1, ensuring they are never forwarded by routers. This limits multicast group membership to the local network.

IP addresses within the range 224.0.0.0 to 224.0.0.255 are always sent with TTL = 1, ensuring they are restricted to the local network.

A message sent by a host to the router to indicate its desire to join a specific multicast group. The host includes the group address it wants to join.

A message sent by a host to the router to indicate its desire to leave a specific multicast group. The host includes the group address it wants to leave.

A multicast group address used by IGMP for general queries. All devices on the network should respond to this query.

A multicast group address specific to the group used by IGMP. Only devices interested in the group should respond to this query.

A message sent by a host in response to an IGMP query to indicate its membership in a specific multicast group. Contains the group address the host is a member of.

IGMP messages are a fixed size regardless of the group address. This helps with efficient network communication.

The time a host waits before sending an IGMP report after receiving a query. It's a random value between zero and a predefined maximum.

The first octet of an IGMP message determines the type and version of the message. For example, a value of 0x11 indicates a query message in version 1.