Multicast; Internet Connection; Ethernet Encapsulation - ZyXEL Communications NBG-419N User Manual

12.3.2 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 80 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-419N supports both IGMP version
1 (IGMP-v1) and IGMP version 2 (IGMP-v2).
At start up, the NBG-419N queries all directly connected networks to gather group membership.
After that, the NBG-419N periodically updates this information. IP multicasting can be enabled/
disabled on the NBG-419N LAN and/or WAN interfaces in the Web Configurator (LAN; WAN).
Select None to disable IP multicasting on these interfaces.

12.4 Internet Connection

Use this screen to change your NBG-419N's Internet access settings. Click WAN from the
Configuration menu. The screen differs according to the encapsulation you choose.

12.4.1 Ethernet Encapsulation

NBG-419N User's Guide
Chapter 12 WAN
105