3Com 3C16685 User Manual page 60

60 C 3: U
HAPTER
Need to Know (NTK) In normal Hub operation, packets received
are sent to all ports irrespective of the packet destination address.
With NTK enabled, the Hub sends a packet to its destination
address, but will scramble it when sending the packet to all the
other secure ports.
1 To enable and disable DUD and NTK using the command line
interface, at the Top-level menu enter:
ethernet security
The following prompt is displayed:
Select Ethernet port (1-26): 5
2 You are then prompted to enter the security operation mode
required:
Enter mode (noSecurity, continuallyLearn, autoLearn)
[noSecurity]:
a If you enter
b If you enter
displayed:
Enter the number of authorized addresses (0–33) [1]:
The number of authorized addresses you enter is the number of
devices allowed to transmit or receive on that port. For example, if
you enter
the specified port. When a new address is received, the most
recent three addresses received will be remembered, and the
oldest one dropped.
c If you enter
Enter the number of authorized addresses (0–33) [1]:
The number of authorized addresses you enter is the number of
devices allowed to transmit or receive on that port. For example, if
you enter
specified port. Any new addresses will not be allowed to transmit
or receive from this port.
3 If you have entered
following prompt is displayed:
Need to Know Mode (enable, disable) [disable]:
a If you have entered
required.
C
SING THE OMMAND
noSecurity
continuallyLearn
, the Hub will learn three addresses at any one time for
3
autoLearn
, the Hub will remember three addresses only for the
3
continuallyLearn
continuallyLearn
L I
INE NTERFACE
, all security features will be disabled.
, the following prompt is
, the following prompt is displayed:
or the
autoLearn
enable or disable NTK as