ZyXEL nbg-5715 User Guide
Chapter 10 WAN
NBG5715 User’s Guide
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10.3.2 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.
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 37
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.
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 NBG5715 supports both IGMP version 1
(IGMP-v1) and IGMP version 2 (IGMP-v2).
in a multicast group - it is not used to carry user data. The NBG5715 supports both IGMP version 1
(IGMP-v1) and IGMP version 2 (IGMP-v2).
At start up, the NBG5715 queries all directly connected networks to gather group membership.
After that, the NBG5715 periodically updates this information. IP multicasting can be enabled/
disabled on the NBG5715 LAN and/or WAN interfaces in the Web Configurator (LAN; WAN). Select
None to disable IP multicasting on these interfaces.
After that, the NBG5715 periodically updates this information. IP multicasting can be enabled/
disabled on the NBG5715 LAN and/or WAN interfaces in the Web Configurator (LAN; WAN). Select
None to disable IP multicasting on these interfaces.
10.4 The Broadband Screen
Use this screen to change your NBG5715’s Internet access settings. Click Configuration >
Network > WAN to open the Broadband screen. The screen differs according to the
encapsulation you choose.
Network > WAN to open the Broadband screen. The screen differs according to the
encapsulation you choose.
10.4.1 Ethernet Encapsulation