ZyXEL Communications P-2302HW manual Using IP Multicast, Prestige 2302 Support Notes

Prestige 2302 Support Notes

Using IP Multicast

•What is IP Multicast ?

Traditionally, IP packets are transmitted in two ways - unicast or broadcast. Multicast is a third way to deliver IP packets to a group of hosts. Host groups are identified by class D IP addresses, i.e., those with "1110" as their higher-order bits. In dotted decimal notation, host group addresses range from 224.0.0.0 to 239.255.255.255. Among them, 224.0.0.1 is assigned to the permanent IP hosts group, and 224.0.0.2 is assigned to the multicast routers group.

IGMP (Internet Group Management Protocol) is the protocol used for multicasting. There are currently two versions: versions 1 and 2. Through IGMP, IP hosts are able to report their multicast group membership to any immediate-neighbor multicast routers which decide if a multicast packet needs to be forwarded.

At start up, the Prestige queries all directly connected networks to gather group membership information. The Prestige then updates the information through periodic queries.

The Prestige supports IGMP versions 1 and 2. You can enable/disable multicast setting on the Ethernet interface or to the remote node.

•IP Multicast Setup

Enable IGMP on the Prestige's LAN interface in menu 3.2:

Menu 3.2 - TCP/IP and DHCP Ethernet Setup

DHCP= Server	TCP/IP Setup:
Client IP Pool:
Starting Address= 192.168.1.33	IP Address= 192.168.1.1
Size of Client IP Pool= 32	IP Subnet Mask= 255.255.255.0
First DNS Server= From ISP	RIP Direction= Both
IP Address= N/A	Version= RIP-1
Second DNS Server= From ISP	Multicast= IGMP-v2

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