ETHERNET EXTENDERS—CONFIGURATION GUIDE
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Multiple Filters
Up to 18 filters can be defined. If there are 2 filters which have contradictory operations, forwarding takes
precedence over blocking.
Example:
You want to allow only one particular user on the small-office LAN to access the Internet for FTP purposes. To
ensure that no one else is able to access the Internet, create a blocking filter for all traffic going to the link. To
do this, from the Blocking and Forwarding menu enter “Block all traffic for Link1.” In addition, create a filter
to test each packet for the IP host address of the specified user and the FTP socket of the packet. Since
forwarding takes precedence over blocking, that user’s frames are forwarded.
Definition of Filter Tests
You need to define the filter test which will be applied to every packet that is transmitted. Use any combination
of the following parameters to define the filter test:
• Protocol.
• Operation (block, forward, etc.).
• Interface (LAN, Link).
• Destination and/or source IP address of the packet.
• Destination and/or source MAC address of the packet (layer 2).
• IP socket (upper and lower level).
• IP packet type (broadcast, multicast).
NOTE
Up to 18 filters can be defined. To avoid reducing Ethernet Extender performance,
minimize the number of active filters.
D
EFINING
F
ILTERS
Filters can be defined through the control port, TELNET, or SNMP. First decide on the mode and conditions
for a filter, then follow the instructions below to set filter parameters.
NOTE
Remember that forwarding takes precedence over blocking. If there is combination of
filters which contain both operations, the frame will be forwarded.
Summary of Contents for LB3104A series
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