Ethernet SNMP Module Installation and Reference Guide ( J2603B) 1995-10

Setting Outbound Security with
Eavesdrop Prevention
Eavesdrop Prevention allows a port to receive a packet transmitted on the
network as valid data only if the port’s station address matches the packet’s
destination address. If the port’s station address does not match the packet
destination address, the port will receive a packet containing a meaningless
data field of alternating 1’s and 0’s. Multicast and broadcast packets are
transmitted to all ports unmodified.
Note that sending a packet containing alternating 1’s and 0’s will continue to
allow the port to detect the traffic on the network, so that the CSMA/CD
network requirements are met. However, the port will correctly record the
invalid data packet received as a CRC error. An end-user attached to an
HP AdvanceStack hub implementing Eavesdrop Prevention data security
will normally record a high number of CRC errors on the computer card
statistics.
The illustration on the next page shows the use of outbound data security
using Eavesdrop Prevention. This type of data security should be enabled on
any port that is to receive data on a"need to know" basis. The port must have
an authorized station address configured and must be connected to only one
end-user.
Eavesdrop Prevention may not be used on cascaded ports, or ports
connected to a network with multiple end users.
Security Information
Security Information
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