Wireless Mobile & Multimedia Networking Lecture 2: IGMP

A special type of IP address used for sending data to multiple recipients simultaneously.

A network protocol that allows hosts to join and leave multicast groups.

All IP addresses starting with 1110 in binary or 224.0.0.0 in decimal notation.

A range of multicast addresses reserved for routing protocols and network discovery.

A group of routers and hosts that manage the network.

A specific range of multicast addresses assigned to an Autonomous System.

The process of dynamically allocating multicast addresses, where addresses are released when applications are closed.

A unique identifier for a particular network device, consisting of 12 hexadecimal digits (48 bits).

A type of MAC address used to send data to all devices on a network. For broadcasting information.

A type of MAC address used to send data to a specific group of devices on a network. For sending data to multiple devices efficiently.

A type of MAC address used to send data to a single device on a network. Used for one-to-one communication.

A command-line tool used to display network status and information. Provides information about network connections, routing tables, and multicast groups.

A network interface that connects to the LAN. Can be used for sending and receiving network data like unicast, broadcast, and multicast.

The maximum time a host can wait before responding to a query. Longer D means more time for the host to respond.

This feature prevents redundant reports from multiple hosts. If a host receives a report from another host for the same group, it stops its timer and doesn't send its own report.

The Time-to-Live (TTL) value for IP multicast datagrams controls how many hops a datagram can travel. A low TTL limits the reach of the datagram.

A TTL value of 1 limits multicast packets to the local network. This ensures that multicast messages only stay within the immediate network.

A TTL value greater than 1 allows multicast packets to travel beyond the local network. This enables multicast groups to span multiple networks.

Used by hosts to join or leave multicast groups. Routers use IGMP to keep track of membership in a multicast group.

A method for sending data to multiple recipients simultaneously. It's like sending a message to everyone in a group chat.

IGMPv2 allows hosts to explicitly leave a multicast group, ensuring timely removal from group membership and reducing unnecessary traffic.

IGMPv3 introduces source-filtering, giving receivers the control to signal a router about a specific traffic source they want to receive data from.

Routers send a general query when they want to find out which groups have members on an attached network. It's like asking "Anyone still there?"

This type of query is used by routers to learn whether a particular group has any members on an attached network. It's like asking "Anyone still in group xx?"

When a host responds to an IGMP query, it's called a membership report. It's like saying "Yes, I'm still in group xx."

This report is sent when a host joins a multicast group, indicating its desire to receive multicast data. It's like joining a group chat.

A message sent by a host to a router indicating its desire to receive multicast traffic for a specific group.

A message sent by a host to a router indicating its decision to stop receiving multicast traffic for a specific group.

A message sent by a router to discover which hosts on the network are interested in receiving multicast traffic.

A message sent by a host in response to a router's IGMP query, confirming its membership in a multicast group.

A specific type of query message used in IGMP to address a particular multicast group.

A multicast group address used in IGMP to send a general query to all hosts on the network.

A multicast group address used in IGMP messages to identify a specific multicast group.

A delay timer that prevents hosts from immediately sending IGMP reports after receiving a query, allowing for potential updates or changes.

The version of IGMP that does not include the IGMP Leave message, requiring hosts to simply stop sending reports to leave a group.