ZyXEL NBG6503 Manuel d'utilisateur télécharger pdf (Page 101)

Chapter 11 WAN

NBG6503 User’s Guide

101

11.3.2 Multicast

Traditionally, IP packets are transmitted in one of either two ways - Unicast (1 sender - 1 recipient)

or Broadcast (1 sender - everybody on the network). Multicast delivers IP packets to a group of

hosts on the network - not everybody and not just 1.

Figure 71 Multicast Example

In the multicast example above, systems A and D comprise one multicast group. In multicasting,

the server only needs to send one data stream and this is delivered to systems A and D.

IGMP (Internet Group Multicast Protocol) is a network-layer protocol used to establish membership

in a multicast group - it is not used to carry user data. The Router supports both IGMP version 1

(IGMP-v1) and IGMP version 2 (IGMP-v2).

At start up, the Router queries all directly connected networks to gather group membership. After

that, the Router periodically updates this information. IP multicasting can be enabled/disabled on

the Router LAN and/or WAN interfaces in the Web Configurator (LAN; WAN). Select None to

disable IP multicasting on these interfaces.

Router

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ZyXEL NBG6503 Manuel d'utilisateur Page 101