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Hotwire 6210, 6211, and 6381 User’s Guide
Figure 4-15. Bridge Filters
Note: The bridge filter table contains three hidden rules. These rules are entered automatically by the system to ensure
that you don’t lock yourself out of the system. The first rule allows all ARP frames through the system. The second
rule allows all IPv4 frames with the destination MAC address of the modem to go through. The third rule allows all
IPv4 frames with the source MAC address of the modem to go through.
The Apply button will temporarily save these settings. To make the change permanent, click on Tools (at the top of
the page) and select System Commands. At the System Commands page, click on Save All.
Note: On a windows based machine, you can find a MAC address with the ipconfig program. At a command prompt,
type: ipconfig /all
4.6.6 Multicast/IGMP Snooping
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 hosts identified by the same destination IP address. The following statements
apply to host groups:
Anyone can join or leave a host group at will. •
•
•
•
•
There are no restrictions on a host's location.
There are no restrictions on the number of members that may belong to a host group.
A host may belong to multiple host groups.
Non-group members may send UDP datagrams to the host group.
Multicasting is useful when data needs to be sent to more than one device. For instance, if one device is responsible
for acquiring data that many other devices need, then multicasting is a natural fit. Multicasting uses less bandwidth
than sending the same data to individual devices.
To enable Multicasting:
1. From the Home screen, click on Advanced.
2. Under Advanced, select Muliticast. Figure 4-16 illustrates a typical Multicast configuration.
36 April 2004 6210-A2-GB21-00