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User Guide
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If the number of client devices is variable, Multicast transmission will be the most
efficient delivery method.
When multiple client devices are receiving the same information form a Multicast
group, the Multicast Server sends the Multicast group information to each device
once. The client device then handles the Management of the Multicast session to
which it belongs.
Each user can join and leave the Multicast group at any time.
Multicast Address
Multicast IP Address:
As specified by IANA (Internet Assigned Numbers Authority) Class D IP Addresses are
used as destination addresses of Multicast packets. The Multicast IP Addresses range
from 224.0.0.0~239.255.255.255. The following table displays the range and description
of Multicast IP Addresses.
Multicast IP Address range Description
224.0.0.0～224.0.0.255
Reserved Multicast Addresses used for routing protocols
and other Network protocols
224.0.1.0～224.0.1.255
Addresses for Video Conferencing
239.0.0.0～239.255.255.255
Local Multicast Addresses which are used in the local
Network only
Table 8-1 Range of the special Multicast IP
Multicast MAC Address:
When a unicast packet is transmitted in an Ethernet Network, the destination MAC
address is the MAC address of the receiving device. When a Multicast packet is trans-
mitted in an Ethernet Network, the destination is not a single device but a group with
a variable number of members, so a Multicast MAC Address (a logical MAC address), is
used as the destination address.
As stipulated by IANA the high-order or OID (Organizational Identifier) 24 bits of a
Multicast MAC Address will be 01-00-5E while the low-order 23 bits of a Multicast MAC
address are the low-order 23 bits of the Multicast IP Address. The mapping relationship
is described in Figure 8-2.
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