ZyXEL NBG6716 User Guide - Page 87
Internet Connection
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Chapter 10 WAN 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 49 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 NBG6716 supports both IGMP version 1 (IGMP-v1) and IGMP version 2 (IGMP-v2). At start up, the NBG6716 queries all directly connected networks to gather group membership. After that, the NBG6716 periodically updates this information. IP multicasting can be enabled/ disabled on the NBG6716 WAN interface in the Web Configurator (WAN). Select None to disable IP multicasting on these interfaces. 10.4 Internet Connection Use this screen to change your NBG6716's Internet access settings. Click Network > WAN from the Configuration menu. The screen differs according to the encapsulation you choose. 10.4.1 IPoE Encapsulation This screen displays when you select IPoE encapsulation. NBG6716 User's Guide 87