Alvarion BREEZEACCESS SW VERSION 5.1 - Manual (Page 211)

Menus and Parameters
Operation and Administration
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4.2.6.4.3 Ethernet Broadcast/Multicast Limiter
The Ethernet Broadcast/Multicast Limiter parameters, available in both AU and
SU, enable to limit the number of broadcast and/or multicast packets that can be
transmitted per second, in order to prevent the potential flooding of the wireless
medium by certain ARP attacks.
In SUs, the limiter is placed after the Ethernet Broadcast Filters. For this reason,
the limiter will receive only the packets that pass through these filters. If the
Ethernet filters of the SU are disabled, the limiter will be applied to all relevant
packets received.
When the Ethernet Broadcast/Multicast Limiter is enabled and the specified limit
is reached, the unit will send a trap. The trap will be sent periodically till the
number of broadcast/multicast packets will be less than the maximum. The trap
will inform the user how many packets were discarded in the last period.
The Ethernet Broadcast/Multicast Limiter menu allows viewing and setting the
following parameters:
4.2.6.4.3.1 Ethernet Broadcast/Multicast Limiter Option
The Ethernet Broadcast/Multicast Limiter Option defines the limiter’s
functionality. The available options are:
„ Disable: No limiter
„ Limit only Broadcast Packets
„ Limit Multicast Packets that are not Broadcasts
„ Limit All Multicast Packets (including broadcast)
The default selection is Disable.
4.2.6.4.3.2 Ethernet Broadcast/Multicast Limiter Threshold
The Ethernet Broadcast/Multicast Limiter Threshold defines the maximum
number of packets per second that will pass the limiter when it is enabled.
The range is from 0 to 204800 (packets/second).
The default is 50 packets.
4.2.6.4.3.3 Ethernet Broadcast/Multicast Limiter Send Trap Interval
The Ethernet Broadcast/Multicast Limiter Send Trap Interval defines the
minimum time in minutes between two consecutive transmissions of the trap
indicating the number of packets that were dropped by the limiter since the
previous trap (or since the time that the limit has been exceeded).