Multicast; Internet Connection; Ethernet Encapsulation - ZyXEL Communications NBG6503 User Manual

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 73 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 NBG supports both IGMP version 1
(IGMP-v1) and IGMP version 2 (IGMP-v2).
At start up, the NBG queries all directly connected networks to gather group membership. After
that, the NBG periodically updates this information. IP multicasting can be enabled/disabled on the
NBG LAN and/or WAN interfaces in the Web Configurator (LAN; WAN). Select None to disable IP
multicasting on these interfaces.

11.4 Internet Connection

Use this screen to change your NBG's Internet access settings. Click WAN from the Configuration
menu. The screen differs according to the encapsulation you choose.

11.4.1 Ethernet Encapsulation

This screen displays when you select Ethernet encapsulation.
Chapter 11 WAN
Router
NBG6503 User's Guide
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