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Chapter 8 WAN
NBG-460N User’s Guide
135
WAN MAC Address
The MAC address screen allows users to configure the WAN port's MAC address by
either using the factory default or cloning the MAC address from a computer on
your LAN. Choose Factory Default to select the factory assigned default MAC
Address.
Otherwise, click Clone the computer's MAC address - IP Address and enter
the IP address of the computer on the LAN whose MAC you are cloning. Once it is
successfully configured, the address will be copied to the rom file (ZyNOS
configuration file). It will not change unless you change the setting or upload a
different ROM file.
It is recommended that you clone the MAC address prior to
hooking up the WAN Port.
8.3.2 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 95 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-460N supports both IGMP version 1 (IGMP-v1) and IGMP version 2 (IGMP-
v2). For IGMP version 3 (IGMP-v3), you should convert one of the LAN ports to
an IPTV STB port (see Section 8.3.3 on page 136).
At start up, the NBG-460N queries all directly connected networks to gather group
membership. After that, the NBG-460N periodically updates this information. IP
multicasting can be enabled/disabled on the NBG-460N LAN and/or WAN
interfaces in the Web Configurator.
Server
NBG460N
A
B
C
D