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Wireless Traffic
Message Types
When a device in the wireless network transmits data, it can take one of these forms:
• Broadcast: A data message transmitted by one device to all devices in the network.
• Multicast: A data message transmitted by one device to multiple devices in the
network. Unlike broadcast messages, multicast messages do not always include all
devices in the network.
• Unicast - A data message transmitted by one device to another device.
Broadcast and multicast messages are transmitted at 2 Mbit/s when the transmit rate is set
to auto rate, as described in “Transmit Rate” on page 2-5. If the transmit rate is fixed, the
broadcast and multicast messages are transmitted at the fixed rate.
Filters
The following filters are only available using the RoamAbout AP Manager, or a Network
Management Station that uses SNMP.
The RoamAbout AP has three types of filters:
• Protocol
Use the Protocol filter to NOT forward specific protocol traffic to the wireless
network, which can reduce unnecessary traffic and increase the network response time.
However, filtering the wrong protocols can negatively affect the operation of the
network. When solving network problems, you should clear all filters.
• Address
This filter forwards or does not forward traffic based on the client’s MAC address.
— Addresses Denied: A client in the Addresses Denied list cannot access the LAN,
even if the client has been authenticated.
— Addresses Allowed: Clients in the Addresses Allowed list can access the LAN.
Clients must supply their MAC address to the Network Administrator. This filter
is essentially ineffective when also using authentication.
• Rate Limiting (AP 2000 only)
Use rate limiting to enable/disable the default rate limiting, and to enter the maximum
number of rate-limited frames forwarded per second.
By default, the AP 2000 limits multicast traffic to 100 Kbit/sec. Changing this
parameter could cause multicast traffic to use more network bandwidth. Should a
broadcast storm occur when this parameter is disabled, the multicast traffic could cause
a serious degradation of network performance. The R2 does not support the multicast
rate limiting function.