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Packet from a Sun
workstation
®
destined for an IP server is forwarded
once the packet filter is applied
Packet filters on
transmit path
Sun
workstations
®
Sun
Solution: To isolate the IP segments, define a packet filter that discards all
AppleTalk packets received on the transmit path of ports that have only IP
stations connected to them. (All ports would need a packet filter if the filter
were installed on the receive path.)
The filter definition is:
If type field = AppleTalk then discard packet
In the example:
Operand 1 is the type field, which is a 2-byte value at offset 12 in the
Ethernet packet.
Operand 2 is the type field constant value for AppleTalk protocol.
Operator is equal.
The filter is installed as shown in Figure 7-3.
FDDI ports
LANplex
®
2500 system
Compute
server
workstations
®
Figure 7-3 Example of AppleTalk® Filter
About User-defined Packet Filtering
Bridge
relay
Ethernet ports
Macintosh
®
Packet from a Macintosh
for a Sun
workstation is filtered (or
®
discarded) after the packet filter is
applied
Macintosh
workstations
®
workstations
7-5
destined
®
Server
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