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144 Operation
Chapter 4 - Operation and Administration
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To avoid conflicts, a transparent Service Profile cannot be assigned to a Service
if the Service's VLAN ID list includes a VLAN ID that is equal to any of the
already assigned VPL IDs.
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The combination VLAN Transparency Mode On, Hybrid VLAN Mode On and an
empty VLAN List means that only untagged frames should be forwarded. Such
a Service cannot be assigned if there is an assigned non-transparent Service
with VPL ID = None.
4.10.2 Introduction to Filtering Features
The Filtering features allow a network operator to control the traffic in the system
by forwarding or discarding packets according to a set of rules based on multiple
allow/deny criteria. This provides both improved network security and better
utilization of the wireless medium.
The filtering is done at the base station, controlling the traffic between the
network and the wireless link. The filtering features enable:
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Filtering packets arriving from the network interface (From Network Filtering),
using a set of either Layer 2 or Layer 3/Layer 4 Filtering Rules.
¢ Filtering packets arriving from the wireless link (From Wireless Filtering),
using a set of either Layer 2 or Layer 3/Layer 4 Filtering Rules.
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Discarding packets to/from specific MAC addresses (MAC Address Deny List).
This is applicable to MAC Addresses behind SUs.
The filtering functionality is described in Figure 4-3 .