Internet Connection; Ipoe Encapsulation - ZyXEL Communications NBG5615 User Manual

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 52 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 NBG5615 supports both IGMP version 1
(IGMP-v1) and IGMP version 2 (IGMP-v2).
At start up, the NBG5615 queries all directly connected networks to gather group membership.
After that, the NBG5615 periodically updates this information. IP multicasting can be enabled/
disabled on the NBG5615 WAN interface in the Web Configurator (WAN). Select None to disable IP
multicasting on these interfaces.

11.4 Internet Connection

Use this screen to change your NBG5615's Internet access settings. Click Network > WAN from
the Configuration menu. The screen differs according to the encapsulation you choose.

11.4.1 IPoE Encapsulation

This screen displays when you select IPoE encapsulation.
NBG5615 User's Guide
Chapter 11 WAN
97