2.4.4 Group Communication

• Often, sender wants the same packet replicated to multiple receivers eg game updates, mirroring etc
• Network offers multicast to provide this functionality.
• Receivers join a particularly addressed group - class D addresses in IP, 1110XXXX.XXXXXXXX.XXXXXXXX.XXXXXXXX
• Network conspires to deliver packets sent to this address efficiently to all receivers.
• Available in Local Area, not always available in wide area (unfortunately).