- 26 -
4.6.7 Multicast
Multicasting is a form of limited broadcast. UDP is used to send datagrams to all hosts that
belong to what is called a "host group." A host group is a set of zero or more hosts identified by
the same destination IP address. The following statements apply to host groups.
a. Anyone can join or leave a host group at will.
b. There are no restrictions on a host's location.
c. There are no restrictions on the number of members that may belong to a host group.
d. A host may belong to multiple host groups.
e. Non-group members may send UDP datagrams to the host group.
Multicasting is useful when data needs to be sent to more than one other device. For instance, if
one device is responsible for acquiring data that many other devices need, then multicasting is a
natural fit. Note that using multicasting as opposed to sending the same data to individual devices
uses less network bandwidth.
To enable Multicasting, click on Advanced and under Advanced, select Muliticast. Figure 16
illustrates a typical Multicast configuration.
Figure 16 (Multicast)
The apply button will temporarily save this connection. To make the change permanent you need
to click on
Save Settings
(at the side of the page). At the system commands page, click on
Save
All
.
4.6.8 Static Routing
If the ADSL Router is connected to more than one network, you may need to set up a static route
between them. A static route is a pre-defined pathway that network information must travel to
reach a specific host or network. You can use static routing to allow different IP domain users to
access the Internet through the ADSL Router.
The New Destination IP is the address of the remote LAN network or host to which you want to
assign a static route. Enter the IP address of the host for which you wish to create a static route
