www.cooperbussmann.com/BussmannWirelessResources 47
Cooper Bussmann BU-245U-E Wireless Ethernet & Device Server User Manual
• The IP Address filter checks both the source address and the destination address of the message. If either address match, then the
rule is activated.
• ARP filtering applies only to ARP request packets (typically these are broadcast packets) which are sourced from the Ethernet interface and
destined for the wireless interface. (ARP requests from devices on the wireless network will always be passed to the Ethernet interface.ARP
response packets will always be passed).
When configuring a Whitelist it is important to add the Addresses of all devices connected to the BU-245U-E wired Ethernet port,that
communicate over the wireless link. It is particularly important to add the Address of the configuration PC to the Whitelist.Failure to add this
address will prevent the configuration PC from making any further changes to configuration. Design of the filter may be simplified by monitoring
network traffic and forming a profile of traffic on the wired network. Network Analysis software,such as the freely available “Wireshark” program,
will list broadcast traffic sent on the network.
For example, in the example,Device B needs to communicate
with Device E via modems C & D.The Filtering requires that
at Modem C has Device B in its Whitelist and Modem D has
Device E in its Whitelist.With this filtering Device A will be not
be able to access Device E, as Device A is not present in the
Whitelist in Modem C.
If radio links are chained together to form a radio backbone,
it is also important to consider the operation of the Layer 3
Transparent Bridge (Refer Section 3.5).A BU-245U-E Client
will act as a MAC Address translator,as it acts as a MAC
address proxy on behalf of devices connected to its wired
Ethernet port.Addition of BU-245U-E Client MAC addresses
into intermediate BU-245U-E units’ Whitelist filters may be
required for correct operation.
If an erroneous configuration has prevented all access to the module,SETUP mode can be used to restore operation.
MAC Address Filter Configuration:MAC addresses are uniquely assigned to each device and so can be used to permit or deny network access to specific devices through the use of
Blacklists and Whitelists.
In theory,MAC filtering allows a administrators to permit or deny network access to hosts associated with the MAC address, though in practice
there are methods to circumvent this form of access control through address modification
The MAC filter entry will match only the source MAC address in the packet.
Note: It is important to add the MAC Address of the configuration PC when creating a Whitelist. If the configuration PC is
not on the Whitelist,it will be unable to communicate with the module for further configuration.
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