Owner manual

IP Setup 7-33
Multicast Forwarding
Multicasting is a method for transmitting large amounts of information to many, but not all, computers over an
Internet. One common use is to distribute real time audio and video to the set of computers which have joined
a distributed conference.
Multicasting is similar to radio or TV broadcasts in the sense that only those who have tuned in to a particular
frequency receive the information. You see and hear the channel you are interested in, but not the others.
Since a router should not be used as a passive forwarding device, Netopia Routers use a protocol for
forwarding multicasting. This protocol is Internet Group Management Protocol (IGMP). Netopia Routers can use
either IGMP Version 1, Version 2, or Version 3, however, Multicast For warding will only work if your service
provider supports it. Check with your service provider. IGMP forwarding is enabled per IP Profile and WAN
Connection Profile.
You configure Multicast For warding in two Telnet menu screens:
• First, you enable Multicast Forwarding in the IP Setup screen in the System Configuration menu,
• Then you associate it with a Connection Profile in the IP Profile Parameters screen in the
Add/Display/Change Connection Profile menus.
Navigate to the IP Setup screen.
By default, Multicast Forwarding is tuned off (None). You enable the gateway to transmit multicast data by
selecting Tx. from the pop-up menu.
You can fine-tune IGMP options in the IGMP Setup menu. See “IGMP (Internet Group Management Protocol)” on
page 3-39.
IP
System Configuration
Main
Menu Setup
IP Setup
Ethernet IP Address: 192.168.1.1
Ethernet Subnet Mask: 255.255.255.0
Define Additional Subnets...
Default IP Gateway: 0.0.0.0
Backup IP Gateway: 0.0.0.0
Primary Domain Name Server: 0.0.0.0
Secondary Domain Name Server: 0.0.0.0
Domain Name:
Rip Options...
Proxy Arp Enabled: +----------------+
Multicast Forwarding... +----------------+
| None |
| Tx. |
VRRP Options... +----------------+
Static Routes... IP Address Serving...