SMC Networks ADSL Barricade SMC7204BRA - Manual (Page 150)

Configuring IP Filters and Blocked Protocols
152
To block a protocol, click the appropriate check box, and click
[Submit]. After you have verified that the device continues to
function as expected, click the [Admin] tab. Click [Commit &
Reboot] in the task bar, then click [Commit] to save your changes
to the permanent memory.
IPV6 Multicast This field displays IP Multicasting under IP Protocol version 6.
See IP Multicast above.
802.1.Q This IEEE specification defines a protocol for virtual LANs on
Ethernet networks. A virtual LAN is a group of PCs that function as
a local area network, even though the PCs may not be physically
connected. They are commonly used to facilitate administration
of large networks.