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Note: The MAC filter table contains 3 hidden rules. These rules are entered automatically by the
system to ensure the user does not "lock" them out of the system. The first rule allows any and all
ARP frames through the system. The second rule allows all IPv4 frames with the destination MAC
address of the bridge to go through. The third rule allows all IPv4 frames with the source MAC
address of the bridge to go through.
Note: On a windows based machine, to find a MAC address, at a dos prompt type ipconfig /all.
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.
4.6.7 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)
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