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5.6.1. Implementing IP Security
The PLS-345 can be configured to restrict unauthorized IP
addresses from Telneting to the unit. This allows the user to
grant Telnet access only to a specific group of IP Addresses, or
block a particular IP address from gaining access. In the default
state, the PLS accepts incoming IP connections from all hosts.
To configure the IP Security feature, proceed as follows:
1. Access the Network Parameters menu as described in
Section 5.6. Note that the Network Parameters Menu and
IP Security Menu are not available in User Mode.
2. When the Network Parameters menu appears, type 4 and
press [Enter] to access the IP Security menu (Figure 5.5).
3. The IP Security menu lists five IP Security "masks" along
with the selected permit/deny action for each mask.
a) Each Security Mask prompt is used to define a specific
IP address or range of IP addresses. Each Mask
Action prompt is used to define the permit/deny action
for the corresponding Mask.
b) Masks are listed in order of ascending priority; Mask 1
has the lowest priority, Mask 5 has the highest priority.
c) Masks have a cumulative effect; high priority masks
supersede the effect of lower priority masks.
d) Each IP Address consists of a series of four eight bit
numbers. The number 255 is used as a wild card.
5-11
Section 5: SetUp and Configuration
IP SECURITY:
1. Security Mask #1: (undefined)
2. Mask #1 Action: Permit
3. Security Mask #2: (undefined)
4. Mask #2 Action: Permit
5. Security Mask #3: (undefined)
6. Mask #3 Action: Permit
7. Security Mask #4: (undefined)
8. Mask #4 Action: Permit
9. Security Mask #5: (undefined)
10. Mask #5 Action: Permit
Enter Selection or <ESC> to Exit ...
Figure 5.5: The IP Security Menu