Nera WILINK I System Manual page 167

Chapter 4 - Operation and Administration
NOTE
Broadcasts and Management frames received from the network, whose destination is the
NPU, are never filtered.
ARP messages will be forwarded automatically if the following conditions are met:
1. Active Rule Type is L3/L4.
2. The L3/L4 Filtering Rules List includes at least one L4 Filtering Rule (a defined protocol).
3. The Default Action is Allow.
This is applicable for both interfaces.
4.10.4.10 Filtering Examples
Example 1: Block All Broadcasts Except ARP and PPPoE
To block all broadcasts except ARP and PPPoE, define an L2 Filtering Rule that
includes all other broadcasts. Typically this includes broadcasts with IP
Ethertype. The parameters of this rule will be:
MAC Address: FF-FF-FF-FF-FF-FF
MAC Address Mask: FF-FF-FF-FF-FF-FF
MAC Address Direction: Destination
Ethertype: 800
Assuming the intention is to block this broadcast in both directions, this Filtering
Rule should be included in the L2 Filtering Rules List of both the From Network
Filtering and the From Wireless Filtering. In addition, for both Interfaces the
following configuration should be defined:
Active Rule Type: Layer 2
Admin Status: Enabled
Default Action: Deny
If broadcasts using other Ethertypes except IP, ARP and PPPoE are excepted,
similar Layer 2 Filtering Rules should be defined for these Ethertypes (with the
broadcast MAC Address), and these rules should be added to the applicable Layer
2 Filtering Rules Lists.
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WILINK I MODULAR BASE STATION SYSTEM MANUAL