Telkom duoPlus 300WR, Manual

Page: 63 / 127

duoPlus 300WR User Manual
Page 63 of 127
IGMP Proxy
IP hosts use Internet group management protocol (IGMP) to report their multicast
group memberships to neighboring routers. Similarly, multicast routers use IGMP to
discover which of their hosts belong to multicast groups. Your router supports IGMP
proxy that handles IGMP messages. When enabled, your router acts as a proxy for a
LAN host making requests to join and leave multicast groups, or a multicast router
sending multicast packets to multicast groups on the WAN side. This service is
disabled by default.
IGMP Proxy
Multicasting is a form of limited broadcast. UDP is used to send datagram’s to all
hosts that belong to what is called a Host Group. A host group is a set of one or
more hosts identified by a single IP destination address. The following statements
apply to host groups:
ƒ
Anyone can join or leave a host group at will.
ƒ
There are no restrictions on a host’s location.
ƒ
There are no restrictions on the number of members that may belong to a
host group.
ƒ
A host may belong to multiple host groups.
ƒ
Non-group members may send UDP datagram’s to the host group.