Instruction manual

2-82
BreezeACCESS Version 4.5 Operations and Administration
Manual Revision: 1.0
supports quality of service based on IPv4 ToS, the value of this
parameter should be configured according to the definitions of
the router/gateway in order to take advantage of the QoS feature
and to ensure that voice packets will be handled accordingly.
# Valid values are 0-255.
# The default value is 0.
" ToS Precedence Threshold (AU and SU) – ToS based
prioritization is in accordance with the precedence bits of the
ToS field in the IP header. An IP packet received from the
Ethernet port will be routed to the Mid queue if one of the
following conditions is met:
a The precedence in the ToS field is higher than the value of
the ToS Precedence Threshold parameter (applicable to both
tagged and untagged frames).
b The VLAN Priority field in a tagged frame (hybrid or trunk
link) is higher than the value of the VLAN Priority Threshold
parameter.
All other packets received from the Ethernet port will be
routed to the Low queue.
Valid values are 0 to 7.
The default value is 3.
Ethernet Broadcast Filtering
The filtering parameters enable defining the Layer 2 (Ethernet)
broadcast and multicast filtering capability in SUs. The Ethernet
Broadcast Filtering allows enhancing the security of the system and
saving bandwidth on the wireless media through blocking protocols that
are typically used in the customer’s LAN but are not relevant for other
customers (e.g. NetBios that is used by Microsoft Network
Neighborhood). Enabling this feature blocks Ethernet broadcasts and
multicasts (the I/G bit at the destination address is set to 1).
The 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 media 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. In case that the Ethernet filters of the SU are disabled, the
limiter will be applied to all relevant packets received.
When the Ethernet Broadcast Limiter is enabled and the 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.