Allied Telesis AT-AR256E - Manual (Page 25)

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the “Apply” button. The “Select All” select box can also be used to delete the entire filter rule. It
provides a quick method of selecting all filter rules for deletion.
The “Enable MAC Filters” button allows the user to enable or disable MAC filtering. It can be
set/unset during any add/edit/delete operation. It can also be set/unset independently by just
clicking the “Apply” button.
Figure 15 (MAC Filters)
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 the 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.